Display instance version in settings UI if possible

[opusforlife2]

Would it be possible to programmatically obtain the version code for every instance URL at the time of fetching the instance list (or when the extension's main data source is updated)?

The idea is that instead of having to manually open each instance and check the version, the user could easily glance at the instance list for that service and see which instances are on old versions, and thus likely unmaintained or neglected.

The instance version could be displayed as a label next to the URL.

[ManeraKai]

This requires each frontend to have an API like https://instance.xyz/_version so I can fetch them.

[opusforlife2]

Got the idea from frontends like Piped and Invidious, which themselves have instance list/health pages. I hope all such APIs are publicly accessible.