see https://github.com/dendronhq/dendron/blob/master/packages/engine-server/src/markdown/remark/backlinks.ts#L76:L76 to get backlinks, you can use

note?.links.filter(ent => ent.type === "backlink")

getting started docs are here: https://docs.dendron.so/notes/sPDJcZPRfXhKwnmnh9Pea