Ohh you don't want the header, either. Okay!
It will look like this:
if(equals(outputs('Get_response_details')?['body/rff0b6cb059274e269bda63cde0759d2d'],null),'',concat('Contacts Per Hour:',outputs('Get_response_details')?['body/rff0b6cb059274e269bda63cde0759d2d']))
In the email, it will end up looking like this (one of these for each field):

Also I just copied in the 'null' without doing the expression so I guess in this instance it can just be typed. News to me!
Anyway, to enter those in, click in the body of the email, click on the Expression tab to the right of the Dynamic Content tab.
You can copy paste this in:
if(equals(FORMFIELD1,null),'',concat('FIELDTITLE:',FORMFIELD1))
For the orange bit, you'll type it right on in there. For the FORMFIELD1 (on both sides), use dynamic content and point it at the relevant form field.