diff --git a/src/content-tags-drawer/data/api.js b/src/content-tags-drawer/data/api.js
index 28bd7a36c8..4ad0275e4f 100644
--- a/src/content-tags-drawer/data/api.js
+++ b/src/content-tags-drawer/data/api.js
@@ -29,6 +29,7 @@ export const getTaxonomyTagsApiUrl = (taxonomyId, options = {}) => {
   return url.href;
 };
 export const getContentTaxonomyTagsApiUrl = (contentId) => new URL(`api/content_tagging/v1/object_tags/${contentId}/`, getApiBaseUrl()).href;
+export const getContentTaxonomyTagsCountApiUrl = (contentId) => new URL(`api/content_tagging/v1/object_tag_counts/${contentId}/?count_implicit`, getApiBaseUrl()).href;
 export const getXBlockContentDataApiURL = (contentId) => new URL(`/xblock/outline/${contentId}`, getApiBaseUrl()).href;
 export const getLibraryContentDataApiUrl = (contentId) => new URL(`/api/libraries/v2/blocks/${contentId}/`, getApiBaseUrl()).href;
 
@@ -54,6 +55,16 @@ export async function getContentTaxonomyTagsData(contentId) {
   return camelCaseObject(data[contentId]);
 }
 
+/**
+ * Get the count of the tags that are applied to the content object
+ * @param {string} contentId The id of the content object to fetch the applied tags for
+ * @returns {Promise<Object>}
+ */
+export async function getContentTaxonomyTagsCountData(contentId) {
+  const { data } = await getAuthenticatedHttpClient().get(getContentTaxonomyTagsCountApiUrl(contentId));
+  return camelCaseObject(data[contentId]);
+}
+
 /**
  * Fetch meta data (eg: display_name) about the content object (unit/compoenent)
  * @param {string} contentId The id of the content object (unit/component)
diff --git a/src/content-tags-drawer/data/api.test.js b/src/content-tags-drawer/data/api.test.js
index 9fa88dcb79..1863c8d833 100644
--- a/src/content-tags-drawer/data/api.test.js
+++ b/src/content-tags-drawer/data/api.test.js
@@ -13,10 +13,12 @@ import {
 import {
   getTaxonomyTagsApiUrl,
   getContentTaxonomyTagsApiUrl,
+  getContentTaxonomyTagsCountApiUrl,
   getXBlockContentDataApiURL,
   getLibraryContentDataApiUrl,
   getTaxonomyTagsData,
   getContentTaxonomyTagsData,
+  getContentTaxonomyTagsCountData,
   getContentData,
   updateContentTaxonomyTags,
 } from './api';
@@ -88,6 +90,17 @@ describe('content tags drawer api calls', () => {
     expect(result).toEqual(contentTaxonomyTagsMock[contentId]);
   });
 
+  it('should get content taxonomy tags count', async () => {
+    const contentId = 'block-v1:SampleTaxonomyOrg1+STC1+2023_1+type@vertical+block@aaf8b8eb86b54281aeeab12499d2cb0b';
+    const dataMock = {};
+    dataMock[contentId] = 1000;
+    axiosMock.onGet(getContentTaxonomyTagsCountApiUrl(contentId)).reply(200, dataMock);
+    const result = await getContentTaxonomyTagsCountData(contentId);
+
+    expect(axiosMock.history.get[0].url).toEqual(getContentTaxonomyTagsCountApiUrl(contentId));
+    expect(result).toEqual(1000);
+  });
+
   it('should get content data for course component', async () => {
     const contentId = 'block-v1:SampleTaxonomyOrg1+STC1+2023_1+type@vertical+block@aaf8b8eb86b54281aeeab12499d2cb0b';
     axiosMock.onGet(getXBlockContentDataApiURL(contentId)).reply(200, contentDataMock);
diff --git a/src/content-tags-drawer/data/apiHooks.jsx b/src/content-tags-drawer/data/apiHooks.jsx
index 1b95f60936..e7afba6d03 100644
--- a/src/content-tags-drawer/data/apiHooks.jsx
+++ b/src/content-tags-drawer/data/apiHooks.jsx
@@ -1,5 +1,6 @@
 // @ts-check
 import { useMemo } from 'react';
+import { getConfig } from '@edx/frontend-platform';
 import {
   useQuery,
   useQueries,
@@ -9,6 +10,7 @@ import {
 import {
   getTaxonomyTagsData,
   getContentTaxonomyTagsData,
+  getContentTaxonomyTagsCountData,
   getContentData,
   updateContentTaxonomyTags,
 } from './api';
@@ -138,5 +140,38 @@ export const useContentTaxonomyTagsUpdater = (contentId, taxonomyId) => {
     onSettled: () => {
       queryClient.invalidateQueries({ queryKey: ['contentTaxonomyTags', contentId] });
     },
+    onSuccess: /* istanbul ignore next */  () => {
+      if (window.top != null) {
+        // This send messages to the parent page if the drawer is called from a iframe.
+        // Is used on Studio to update tags data and counts.
+        // In the future, when the Course Outline Page and Unit Page are integrated into this MFE,
+        // they should just use React Query to load the tag counts, and React Query will automatically
+        // refresh those counts when the mutation invalidates them. So this postMessage is just a temporary
+        // feature to support the legacy Django template courseware page.
+
+        // Sends content tags.
+        getContentTaxonomyTagsData(contentId).then((data) => {
+          const contentData = {
+            contentId,
+            ...data,
+          };
+          window.top?.postMessage(
+            { type: 'authoring.events.tags.updated', data: contentData },
+            getConfig().STUDIO_BASE_URL,
+          );
+        });
+        // Sends tags count.
+        getContentTaxonomyTagsCountData(contentId).then((data) => {
+          const contentData = {
+            contentId,
+            count: data,
+          };
+          window.top?.postMessage(
+            { type: 'authoring.events.tags.count.updated', data: contentData },
+            getConfig().STUDIO_BASE_URL,
+          );
+        });
+      }
+    },
   });
 };