Wait a second. Do you mean there is no sync possibility? Because the browser storage is far from reliable. I don't see this as "safe" if the data is not synced or backed up somewhere else.
You can make some adjustments in the settings[1] to store data in a local folder. Then, use iCloud, Git, or your preferred service to back up your data. Just like the web version of VSCode[2], it can handle local files. The web is just an app and doesn't hold any data.
1. https://eidos.space/settings/storage 2. https://developer.chrome.com/blog/persistent-permissions-for...