You can create any page you want, with forms, data, interactions etc. It should work exactly the same as an embed as it does in a browser window. When you preview your page in the browser, just copy the link so you can embed it in the next steps.
Add HTML in Wordpress
In the Wordpress editor add a Custom HTML block
Paste iFrame with Link
Inside the block paste this code. Replace the source with the desired URL and modify the width and the height to the desired values.