There exists a mechanism in JabRef to add "Cited on pages: ..." to bibliography entries when using JStyle citations.
However, this is presently not accessible to the user to be triggered, thus rendering the feature useless.

Suggestion would be to provide an option to the user to use this feature.

Solution

The solution is simple, albeit will have multiple parts - will require work both on the UI and the backend.

Frontend:

Add an option to use this feature ONLY when a JStyle is selected, maybe somewhere in the OpenOffice Panel Settings:

Hint: Use a listener for style type

Backend:

In the OOBibBase class, we have a boolean alwaysAddCitedOnPages, which is presently always set to false:

Use this to convey the selected option through syncOptions.
Refs. TODO comments added in #11690

Additional:

It would be even better if this can be added as a user preference.
Hint: As an example, see how getOpenOfficePreferences().getSyncWhenCiting() is used to store a similar preference selected from the OO Panel settings.