If adding the answers from fields to the update section is what you need, you may use Jotform for example and map the answers using Zapier/Make.
If you need to set it up in a way that it will update an existing item in the board, you’ll have to use a unique keyword like an ID that will be used to map the updates to an item. For example, submission ID or email address.
You may also use the app SuperForm from the marketplace.