Importing colocated JS (web component) from a library/dependency, anyone?

Yesterday I encountered the following problem for the first time:

Having a dependency on a library that has its JS script modules colocated with the corresponding LiveComponent templates correctly results in having the JS class(es) end up in the library subdirectory within the phoenix-colocated directory, but no manifest file(s) are generated so I wonder how to import those classes and make thus imported web components visible to the app.

Shouldn’t there be support for this?