Ability to map webhook response data with the Program member custom fields for the webhook calls from the campaigns within the program

Currently in the webhook response mapping, we see an option of selecting the program member custom fields from the field dropdown - but in-practice we encounter an exception (RuntimeException:: 877 -- <PMCF field name> not found, to be precise) when the webhook tries to update the response in the PMCF fields. It would be great to be able to write the webhook response data to the PMCFs as this'll allow us to directly map and store the data for the use-cases involving webhook and PMCF.