External address number on technical data

Hi all,

I need to use external address number on the page of technical data on web ui (connection object or premise/pod) but the ADEXT (bu_adext) field does not exist in available fields in configuration. I also checked the available fields on crm gui. So do you know how I can get this field in CRM Web UI? Or can you suggest any field like external address number?

Thanks in advance.