How to Observe and Render a list of root containers

I want to implement a Linkedin comment assistant.
Each time user clicks Comment section, I want to add a RootContainer to (newly created DIV). There may be many DIVs, so render should continuously observe DOM changes and create new Container.

I tried to implement getInlineAnchorList() and custom render, but its not working.
any ideas/direction I need to go?
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