Including Prefix before User ID

I am using Ultimate Member and I am using the feature Display Name Custom Field(s) in my Members page i.e. it shows User ID instead of Profile Name or User Name. I am using following settings:

Profile Permalink Base: User ID
User Display Name: Custom field(s)
Display Name Custom Field(s): User ID

Now it shows user id instead of user name like: 1

Now I want it to display like this: User No. 1

So I want to add this “User No.” before the user ID number. How do I do it?