Dynamically populate default field value

Hi, I’m testing Everest Forms at the link I entered. I’m impressed and want to switch over to it but there’s one basic thing I don’t know how to do. There must be a way to automatically insert a logged-in member’s phone number into my phone field. I’m using Ultimate Member and have a working shortcode to retrieve the info: [um_user user_id=”” meta_key=”mobile_number”]

How can I use it as the default field value?

The page I need help with: [log in to see the link]