CiviGrant labels are...not good
The CiviGrant fields are strange.
The "Amount Requested" field has this description: Requested grant amount, in original currency (optional).
"Total Amount" has this description: Requested grant amount, in default currency.
If you're creating a FormBuilder form for grant requests, it makes sense that you'd want a "Requested Amount" field - but you actually need to use "Total Amount". This is unintuitive, and there's nothing in the field labels to suggest anything about original vs. default currency.
I don't think "Total Amount" makes any real sense here as a label - if anything, I'd expect that to be the amount granted (except that's the "Amount Granted" field).
Proposal "Total Amount" gets relabeled as "Total Amount Requested". "Amount Requested" gets relabeled as "Amount Requested in Original Currency".