Move eMails to folders of a DIFFERENT account

Please add functionality to:
Move eMails to a folder in any account, not just within the one it was received.
I remember having asked about this long time ago.
E.g. in Thunderbird this has always worked. Without any restrictions one can move eMails happily around betrween folders of different accounts.
Please add this function to K9. In everyday life this is helpful if someone uses multiple accounts but wants to group everything together e.g. in the folder of only one account.

Thanks for keeping the app alive, i greatly enjoy k9. Greetings from Vienna,
Roland Schweiger

EDIT: same applies to Thunderbird for Android:
Just installed TB for Android, and all the import settings via qr code from Desktop PC worked fine, with only oauth2 having to re-signin. And RSS + Newsgroups not (yet) supported.
BUT THE REAL QUESTION:

  1. Why are there no LOCAL FOLDERS?? This is such an important feature of the desktop Thunderbird version. Being able to store eMails locally
  2. Why can i not move eMails between folders of different accounts, like in desktop version of Thunderbird? Both are really useful and often experienced features of thunderbird desktop.

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