Thank you all for your consultation. For now, I have installed Self-hosted Livesync. I will use it for a while and give it a try.

Not same as OP, but the reason why I do not use Github is because I do not want my data on what is essentially a Microsoft service. Especially, if I already self-host other services.

Although, I am aware not everyone can afford or wants to self-host, yet in my use case, it was just a matter of just installing NC on an already existing setup.

Is there a way to achieve E2EE with GitHub?