For now using Linux Google Drive Mount to solve the basic problem of sharing/synchronizing my Obsidian vaults privately to myself over a mount. This method is working between my Windows, Chromebook, Ubuntu/Linux, and even my Android phone (special note there)

However there are other options to consider also:
https://github.com/vrtmrz/obsidian-livesync
https://github.com/vrtmrz/self-hosted-livesync-server