Hi @francovg great question. If you are using conditions on the element in CMS, you can flag an element to show or hide based on criteria coming from the Webflow CMS.
If you are trying to show or hide the form field based on whether the form field has some input or not, that is not yet a features of the interactions, but there is a custom solution where you can monitor how many fields have values, then if the required amount is reached, then do a click event on an element having a Tap interaction set.
Here is example custom code, where I am targeting the class “user-field” assigned to the fields. I am checking how many fields have no input. When I get to 1, I know that at least 4 fields have been entered and I do a click event in jQuery to fire the interaction I created on the hidden element.
Here is an example site you can clone to see how it was done: https://webflow.com/website/Conditional-Hidden-Form-Field-Custom-Code-jQuery
Here are some good resources:
Using custom code in the head and body: https://university.webflow.com/article/how-to-add-custom-head-and-body-code-to-a-webflow-site
Using custom code in an embed component on the page: https://university.webflow.com/article/embed