How does the UE parse the .udsmesh files?

Recently I am learning how to parse Datasmith files. I have already found the way to parse the .udatasmith file in the XmlParser. However, I can’t find how the UE parses the .udsmesh files.
Where’s the resolution? Can somebody help me? Does anyone know the answer?
Thank you very much in advance.

I am also trying to find out! Can anyone help??

One of the best clues I found is in the Blender plugin created by Andres Botero
blender-datasmith-export/ at master · 0xafbf/blender-datasmith-export · GitHub (line 160)

Your comment helps me a lot!
Thank you!