Do I always need email field in pop-ups?

Hello Klaviyo community,

I have a doubt how we can collect data from existing customers via forms.

We want to set up a pop-up to collect preferences about a new product release that will only be showed only to customers or people that are already in our email lists.

Since we have already their email address I can omit to add the email field on the form? Klaviyo is able to detect who submitting the form and add answers into respective custom fields?

I would like to keep the forms as simple and straightforward as possible to maximize the submissions, and I feel making people that are already subscribed submit their email address again will turn out to be an high-friction point.

Thanks in advance for the help!

Best,

Jacopo