There are 3 components when adding an HTML email feedback. First is the HTML email itself; second is the API to submit the feedback to; and third is the HTML page that you want the users to get redirected to after submitting the feedback from the email.

Step 1 - Add email action to your chat workflow

Open your chat workflow settings, and add an action to send an email. Typically this action is located at the end of the chat workflow.

Step 2 - Add the HTML template

Copy paste the following HTML template into the chat workflow email settings. Make sure to test on Outlook and that the HTML works there.

Step 3 - Create a web page to redirect user after submitting feedback from email

There are buttons in the feedback email to rate the experience from 1 to 5. Each button is a clickable link. When a user clicks on that link, it should open a web page and the feedback will be submitted from that web page.

And here is an example code of that feedback page users redirect to.