How to use UI Builder for uxml files in local packages?

Unity Engine
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I have a local package and I want to add an editor window to it, but when I try to load the window’s uxml into UI Builder through File > Open, it says “Cannot load .uxml files outside the Project”. I’ve found an answer on the forum that says that I need to open the file through double click to work around it, but it opens the uxml in Rider.
Is there a way to allow the builder to load files in packages or will it be added in update?
I’m running Unity 2021.1.0b1.
Thanks!

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Any solution for this questions?