Import data from other "Session Manager" extensions?

[Darthagnon]

Is your feature request related to a problem? Please describe.
I currently use Tab Session Manager, with many saved sessions (200+ sessions, 100+ tabs, multiple windows per session). I previously used Session Buddy, and Tab Session Manager recently added import options. I'm comfortable storing a large amount of data in those extensions because I can export the data as a JSON for backup or manual re-importing later.

Describe the solution you'd like
Would it be possible to please add an "export all set aside tabs" option? And the ability to reimport that backup file? And the ability to import backup files from other extensions, like Session Buddy and Tab Session Manager? Your GUI is quite a bit nicer than the others.

Additional context
I can't currently trust TabsAsideExtension to store the large amount of sessions I tend to accumulate, without the ability to export an offline backup. I use Ungoogled Chromium, so cloud sync options (which I avoid) can't work, anyway.