you are very wrong as i have done it
Added HTML code to the appropriate field when customizing the form, as in chest 1174
And I got the result I wanted, you can even try how it works.
Here is the link:
https://icoloronebox.crm-onebox.com/form/0/3/By the way, if you need a code because you don't know HTML, and it's difficult to rewrite from a picture, please get in touch.