If there was a binary option for custom fields I could then create a segment based on a yes/no question - eg “do you want to join my mailing list?”
I could then trigger an automation when the contact was added to the segment (which then adds them to my (mailchimp) mailing list via zapier.
@Ben.birdhouse1 I also noted this request as well! Submit this, too, as an official feature request on the Product Roadmap via the ‘Request a Feature’ button.
@Ben.birdhouse1 Hey! I just wanted to make sure you saw that there were some updates to the Zapier integration in case they are of help to you in any way 
•Using Zapier to Automate Connections with Third-Party Apps
•Automate with Wix & Zapier