Hi.
I’m not familiar with UMA so I can’t give you an accurate answer.
However, since it is presumed that the mesh will probably be generated at runtime, I think MagicaCloth should also be created at runtime.
The following documents may help you with this:
https://magicasoft.jp/en/mc2_runtime_build/
However, please note that I will not know if it actually works until I test it.
Also, there is the following dedicated forum for questions about MagicaCloth Ver2.x.
Since this is a forum for Ver1.x, please post Ver2.x to the above forum from next time.