The best way I know to get highlights from kindle (I only use iPhone) is to click the "My Notebook" icon (looks like a letter paper page), click the export button, and then send to email. There is a notecard option there as well but I haven't tried it. Not exactly a solution but I'm mentioning it because it took me a while to notice.
https://forums.developer.amazon.com/questions/68355/regardin...
Upon research, there's a few tools like https://readwise.io/ and clipping.io which are chrome extensions.
They webscrape your homepage highlights here:
https://read.amazon.com/notebook
https://read.amazon.com/kp/notebook?ft
Readwise is like evernote for kindle highlights. It sends 10 or so highlights as a daily message email.