You’d need to use an external system like Make.com to create that entry using Webflow’s API. That part is relatively easy… Logic isn’t quite there yet for the features you need, so you use a different automation service.
However you’ll probably also want to consider the reality that experts may need to update their listings and that means a memberships solution.
Webflow’s User Accounts feature can be used with a bit of custom coding for a simple scenario.
MemberStack offers more login options ( like using Google auth ), better docs and examples for user dashboards, at an added monthly cost.
Wized gives you a richer programming experience and if you’re thinking towards a more complex dashboard experience, I’d recommed that direction.