I have not used it myself, but Nextcloud does have a Google importer tool that includes Photos import - https://nextcloud.com/blog/easy-migration-to-nextcloud-f

I have not used it myself, but Nextcloud does have a Google importer tool that includes Photos import - https://nextcloud.com/blog/easy-migration-to-nextcloud-from-insecure-and-privacy-unfriendly-platforms-now-available/ https://nextcloud.com/blog/easy-migration-to-nextcloud-from-.... It looks like the tool is basically in maintenance mode currently which should mean it works reasonably well - https://github.com/nextcloud/integration_google https://github.com/nextcloud/integration_google.