Looking for a API and WordPress Ninja Forms expert

I have a website with Ninja forms and I can see the JSON output of the form submission which is basically in form of "_field_id":"value", but I need the output to be something like below:

Assume the field_id in the admin is 2020 and the field_key value in the admin is firstname
and the user submitted value for this label is John. So I want the output to be like:

"_field_2020":"John","key":"firstname"

Here is the CURL code that you can run to see the current output and the fields with their id and key values.

*********** Get field names and metadata ***********************


curl -X GET \
'https://staging.aqusagtechnologies.com/CFST/wp-json/nf-submissions/v1/form/49/fields?use_admin_label=1' \
-H 'NF-REST-Key: aff0b58c84bbd5fc1a940bdb9f604214884c78fea0b9c9f09ad0e41fe9c22f39'


***************** Get submissions ***************

curl -X GET \
'https://staging.aqusagtechnologies.com/CFST/wp-json/nf-submissions/v1/form/49/' \
-H 'NF-REST-Key: aff0b58c84bbd5fc1a940bdb9f604214884c78fea0b9c9f09ad0e41fe9c22f39'



I need someone to be able to start this job right away and finish in about 2-3 hours. If you cannot start the work immediately, please do not bid