Encrypted notes synchronized via Syncthing

What I’m trying to do

I synchronize my notes between several devices using Syncthing. I would like to encrypt some of the notes. I don’t want to treat my whole vault as one encrypted file (like turning the vault into an encrypted disk), because then I have to sync the whole vault every time I change one note.

Things I have tried

Searching the forum for “encrypt syncthing” or “encrypt synchronization”, I couldn’t find this exact use case. I assume it is very common though.

I use inline encrypter to encrypt passwords etc. in my notes, works fine with syncthing.