FR: Show annotations when a character or place appears

What problem would this feature solve?

Fantasy and sci-fi books often have many characters, locations, factions, and other terms that are difficult to remember, especially in long series.

Readest already supports annotations, but there is no quick way to access an annotation when the same character or term appears again later in the book.

Describe the solution you'd like.

Allow an annotation to be associated with a specific word or phrase.

For example, if I create an annotation for "Thorin", every subsequent occurrence of "Thorin" could be clickable and display the associated note in a popup or side panel.

For the user, it's a simple toggle when creating a note. Just like the word-replacement feature.

Describe workarounds you may have used to acheive the same results.

I currently use annotations and manually search through them when I need to remember information.

Another workaround is keeping a separate character/location list in an external notes app, but this interrupts the reading experience.

Additional Context

This would be especially useful for large fantasy and sci-fi series.

It could work as an extension of the existing annotation system and could be optional, allowing users to enable or disable contextual annotations.