Idea behind Foam is that they use GitHub and vscode features - answering on your question, I didn't find any extension with this feature.
But more interesting question, do you really need this "copy/paste" feature in your research (or just simple notes)?
This is awesome! Thank you for sharing. On the page you linked, the github link doesn't take me to the repo, just to a generic github page; you might see an increase in users if it did!
Not sure how a 9 euro monthly subscription is justified in comparison particularly since I can use vscode as a power user