I've got 100s or possibly 1000s of place markers in Google Maps. I wonder if it's time that mapping apps start developing a standard for exchanging data? The GD

I've got 100s or possibly 1000s of place markers in Google Maps. I wonder if it's time that mapping apps start developing a standard for exchanging data? The GDPR mentions data portability. If I can't import my place markers (with notes and categories) it would be as bad for me as not being able to import my contact list into a new email client.