Opportunity search field 'Changed at'

I have the requirement to enhance the search for opportunities with a date field where you can enter the date when it was changed and a field by whom it was changed the last time

I checked in GENIL_BOL_BROWSER the component BT and there the search query object BTQOpp - i could not find fields like that there

Does that mean i will have to do GenIL-Programming or is there a better/simpler way to meet the requirement?

Thank you