Any custom hook /API to populate POC fields on IGT Agreement or Agreeement Additional attributes??

Is there any custom hook /API to populate POC fields on IGT Agreement?

For example we used hook to Default the Agreement Number as Order Number we used the the following custom hook procedure - PA_Client_Extn_Igt_Cust.Return_Agreement_num

But we did not find any custom hook to populate the Agreement Additional attributes fields(Point of Contact name, email, phone, Funding Approval details etc.) or the Agreement header fields (Billing frequency etc.)

We want to derive the values to be populated for Agreement header and Additional attributes based on lookup values and rules and not entered manually by the Users