Using Plasmic with a design system like Ant or Material UI

I planned to build a personal project using AntD and code subsitution. Then plasmic released code component which allows users to register their own widgets. I really like this feature but the register processing takes more time than just using code subsitution. So I decided to wait until it becomes easier. During this time, I didn’t use plasmic so my brain got a little bit rusted. I probably need to relearn it.

By the way, may I ask why plasmic do not want to add UI libs like Bootstrap, AntD or Material UI? Is this because of license?