How to insert blots on the marker header

[Batman4496]

Hey guys!

I'm building a module for quill editor where you have the ability to add audio files via link.

I have trouble placing the embed button at the marker head, is there a way we can do this?

Here is how im doing it right now:
https://github.com/Batman4496/quill-audio-embed/blob/main/src/actions/popup-actions.ts