I have successfully written a function & I'm getting the email. But how do I get it to email the record field details? Best I can do is this:

In the function builder if I try to add an expression in the body I get variables under a "Collections" tab but I don't get how to use them. I have included the entire form as an input argument to the function as a "Form Object"

I seem to only get an ID in my email. e.g. 

I could typically do this as  Dear <%=input.Customer_Name%> when (say) I send an on success email but in this case everything seems wrapped inside a function.