Multi-MBOX Import from Thunderbird?

Just trying to migrate from Thunderbird to Evolution
After using TB for almost 10 yrs with dozens of accounts …

Sadly lots of pop3 with many (local) sub folders on each account-inbox
its a pain to import mbox 1 after one for hundreds …

any shell command to send mbox file to evolution and import them in a folder structure
(ideal: mbox-name =newToBeCreated_FolderName)

some help would be greate :wink:
Evolution (3.36.4-0ubuntu1 ) on Ubuntu 20.04.2 LTS

See https://gitlab.gnome.org/GNOME/evolution/-/issues/606 and https://gitlab.gnome.org/GNOME/evolution/-/issues/1297#note_998919