Feature request: Aggregate multiple umaps

[timotoots]

Is your feature request related to a problem? Please describe.
We try to aggregate multiple umaps together. Multiple partners manage their individual maps, but we would like to make one combined map with all partner data together.

Describe the solution you'd like
Allow dynamic import of another map in umap format.

Describe alternatives you've considered
It seems it could be possible to use "remote data" with GeoJSON format, but it means another umap should be able to give it out. There is a way to download GeoJSON, but not dynamically link to it.

Additional context
Thanks for the great software!

[yohanboniface]

Even if it's not an official feature, there is a way to integrate the data of a layer to another map. In the advanced actions, right-click on the "download" button, and "copy link", then use it as remote data in another map:

Of course this could be more user friendly, but that's what exists at this time.