Request Maintenance Fiori app: How to make Standard Field Mandatory

Hi Experts,

In the Standard Fiori app 'Request Maintenance', however tin you marque the Highlighted tract (Technical Object) mandatory?

I tried looking into the 'Manage your solution' exertion nevertheless it seems similar it's not applicable for S/4HANA on-premise system. 

2234180 - SAP S/4HANA Application “Manage Your Solution“ - SAP for Me

I'm presently looking into SPRO but haven't recovered related config truthful far.

Thanks