Is there anything like a self-hosted version of medium of substack ?

And by that I mean,

An http server that serves word-like rich formatted text documents and includes a web-based rich formatting text editor to write and edit these documents.

With some searching I found these might be candidates

GhostWriteFreely / Write.asPlume

And maybe the following editors in some kind of standalone mode

TipTapEditor.jsQuill.jsCKEditor 5Slate.js