The context area is always filled in the same way. You can also use the Business Add-In CRM_IUICMD_BADI to influence and change the information displayed. To prevent the need to implement any changes made at all points in the system, you should only use the Business Add-In CRM_IUICMD_BADI to fill the context area.
https://service.sap.com/sap/support/notes/2068899
You have to implement the method FILL_CALL_DISPLAY for example to display the house number supplement.