Activity: tell what are the changed made

Hi,

I use:

docker exec --user www-data nc php occ serverinfo:update-storage-statistics -v
docker exec --user www-data nc php occ status
  - num_users: 11
  - num_files: 1812492
  - num_storages: 13
  - num_storages_local: 0
  - num_storages_home: 0
  - num_storages_other: 13
  - installed: true
  - version: 27.1.5.1
  - versionstring: 27.1.5
  - edition: 
  - maintenance: false
  - needsDbUpgrade: false
  - productname: Nextcloud
  - extendedSupport: false

I recently received a push information that a contact in the calendar that I share with all my family was modified.
I know who it is, but I do not know witch field has been modified.
I only get this information:
Somebody Updated the following contact Name1 et Name2 in the calendar CalendarName
Would-it-be possible to add a feature to show the modified field with value before and after modification in the activity, for all contact, calendar and task?

Thanks
Pierre NIKOLOV

No implementation files or tests are named. Start by tracing how activity entries and push notifications are generated for contact, calendar, and task updates; done means reporting each changed field with its previous and new value in both activity and push output.