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I'm looking for a simple solution like this to easily keep encrypted .Md files as a journal.

For passwords keepassxc does everything I need.

That the beauty of the KeePass format, if you don't like the UI, there's usually another app that can read it.

There's a list of compatible apps

* KeePassXC (Windows, Linux, MacOS): https://keepassxc.org/

* KeeWeb (Windows, Linux, MacOS, Web): https://keeweb.info/

* AuthPass (Windows, Linux, MacOS, iOS, Android): https://authpass.app/