Add some different app in Disroot App

Hello to you all,
the Disroot App from Fdroid is nearly perfect for my personal use. I have only 2 minor problems:

is possible to “add” Fairemail inside the DisApp?
now is possible to use only K9 Mail but I am a user of Fairemail from many years.

is possible to add another note app inside DisApp?
Personally I use Joplin from Fdroid because I can add some pictures to the notes If I need. There are also many different note app in Fdroid.

Many thanks to the Disroot Team