Thank you for the quick reply!
I didn’t know about widget decorations, I’ll look into that first. Leaning towards that approach, since the contents of the timestamp are sort-of tied to the editor. I already have a plugin with a separate data structure that saves the start- and end timestamp of each word as per this link.
IMO, each paragraph should show the start timestamp of the first word in the text, correctly handling cases where the user could add/delete words or place the caret in the middle of a paragraph and press enter. I’ll check if it’s feasible to add widget decoration to this plugin so I can easily access that data structure and handle transactions accordingly.
Thanks for the tip!