as microsoft will shift .net6 and blazor to develop cross-platform app, and there is no 3d solution for that, will babylon official support .net6 or blazor?
This is more my personal opinion than the official stance of Babylon. And I can only assume that this is the official answer as well 
Babylon will stick with typescript, as it proven to be a wonderful web-based language to build large-scale applications. Even more - Babylon native will allow you to compile typescript/javascript applications to native applications. So we are actually doing exactly the opposite - we make typescript the cross-platform language.
There seems to be a new cross-platform framework on a weekly base. They are addressing the needs for their communities (in this case the .net community). But we are a web community, and we (i hope) believe that the web should stay webby
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Some enterprising folks have already taken the steps you’re looking for in this direction. Fortunately for all of us, they’ve also written and shared about those steps!
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Sorry to bring up the old post again, but maybe someone else is interested in this topic. 
I’m also experimenting with Blazor at the moment and came across the following project:
This is a typescript interop generator for Blazor. Fortunately the author has implemented an example with Babylon.js! 
There is a tutorial in this post: 
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