Allow use of Merge Fields in Update Contact campaign element

It'd like to be able to use merge fields when setting a field value through the "Update Contact" element in a campaign.

Use case: I want to pre-populate a calendar booking page with the contacts information. I have a custom field for this customized booking link.

When an Ontraport user is on the phone with a contacts, I want them to be able to click the link and have it pre-populate the contact information.