Import read feed entries from Thunderbird?

Before switching to FreshRSS, I used Thunderbird as my RSS reader. Over the years, thousands of entries have accumulated in the program's profile. It would be great if these read items could also be imported into FreshRSS in some way. In my case, there are mostly sentimental reasons for this, but see if someone else would benefit from such a feature.

Technically, I didn’t get much out of it, but I managed to find out is that Thunderbird stores articles in MSF files, as well as email messages, by default.

Do you think such a feature is worth the effort?

Thanks,
Laszlo