That can import each others backup file yknow like the android backup file can be imported on the linux client and vice versa
any notes apps that saves as .txt, .md and other file formats are your best bet to be easily editable on many systems
I thought most note apps just save the note as plain text anyway. And there are many cross-platform solutions, e.g., standardnotes, logseq, siyuan, notesnook.
Joplin is flawless. It works across android-linux-windows (mac?)
I can highly recommend Notesnook. I’m using it on my Android mobile and it automatically syncs everything to my Linux desktop app. There is a browser based webapp but I don’t bother with that as the desktop app is better imo. I migrated from the Pro version of Todoist as that was coming up for renewal. There is a decent free version of Notesnook which might suit your needs but I went for the paid subscription as that was better for my use-case. End-to-end encrypted too which is nice 
I tried Standard Notes too which also looked decent but ultimately decided on Notesnook. Hope that helps