I haven't touched it in a while, but I wrote some code to extract data from apple notes and export to html, quiver, or bear formats. (bear is markdown-like, it looks like I targeted HTML for quiver.) It could be adapted to your needs if you know a little python:
https://github.com/dunhamsteve/notesutils
It might need updating for features added in the last few years, but the cron job I have it running in is still working. (The html version dumps the drawings as svg, but png versions are available too.)