How to submit data to Fundraising from Gravity Forms

To allow users to create a complete fundraising campaign without access to the backend...I have successfully created a Gravity Form to allow a logged in user to submit everything required...except getting the submitted award levels and award level descriptions successfully submitted to the Fundraising fields.

I've tried wdf_level_amount and wdf[levels][0][amount] (with and without row numbers) and in both cases the fields in the editor appear but are empty...

So the question: 1) how to get it configured so input from Gravity is successful?