UNITY | How to connect the skeleton and 3d model?

Question

Unity

Tell me, is it possible to connect a 3d model in unity and a skeleton? There is a ready-made model in pmx format and a skeleton for it, but in fbx format, is it possible to connect them in UNITY without resorting to using a 3d editor?
(if everything is shoved into pmx, then unity does not collect an avatar for the model, and if everything is in fbx, then the texture quality (for some reason) is eaten up and the number of polygons hurts performance)

Answer 1

The problem was solved by a stupid search for information on the Asian segment of the Internet.
Instead of the mmd_tools plugin, I used MMD4Mecanim, it also gives its high-quality shaders, and normally the model in FBX translates directly into unity.
Direct link to the plugin:
stereoarts.jp/MMD4Mecanim_Beta_20200105.zip
Link to the developer's site :
stereoarts.jp http://laboratoriesx86.wordpress.com/2015/04/26/t...