Today, only select Custom Contact Attributes from Survey answers can be sent through Webhooks—specifically, single choice or multi-choice fields, but not Text Input.

We want to be able to send all survey answers, including both text input and choice fields, through a Webhook.

In fact, custom attributes are not even stores with the Contact to begin with, so the problem may be before the webhook!

This was confirmed not possible in Ticket: https://tickets.myclickfunnels.com/support/tickets/3772961