I’ve used this for probably a decade at this point… Not FOSS, but you can use it for free or get a lifetime membership for $25. I’ve reached out to the developer a few times in the past and she was receptive and kind

https://www.copymethat.com/

Damn, that looks super good! Well done!

Xournal++ could work, though it’s more geared toward hand-written notes.

https://xournalpp.github.io/

Congrats! Very rewarding to have a successful run after recovering from an injury