Is it possible to build a task that takes arbitrary kwargs?

[austind]

I'm building a task that needs json input which might vary between invocations. I can define a json positional arg and pass raw quoted json, but it would be easier to do this:

invoke my-task --key1=val1 --key2=val2

This doesn't work:

@task
def my_task(ctx, **kwargs):
    for k, v in kwargs.items():
        print(f"key: {k}, val: {v}")

invoke my-task --foo=bar
No idea what 'bar' is!

Didn't see anything in docs or open issues, have I missed something?