¿How can I prefill a part of a form that is embedded in my website?

Hello,

I currently know how to use links that have a pre-filled field for the form. What I want now is to have a pre-filled field in the form that is embedded in my website.

Pre-filled form-only: https://form.jotform.com/210395825119861?agente=AAAAA

Website with the form embedded: https://www.movo-novo.com/pages/vender-o-intercambiar-mi-bicicleta

I found that the same applies to the website that I am embedding the form into. If I finish my website's URL with "?agente=AAAAA", It will also pre-fill the input "agente". The final link would look like this:

https://www.movo-novo.com/pages/vender-o-intercambiar-mi-bicicleta?agente=AAAAA