How do I embed google conversion code to the 'Thank You' page of a form?

Since it is not possible to embed script in the thank you page (filtered for security reasons). I suggest to try my colleague's suggestion on this thread https://www.jotform.com/answers/30225.

Basically, what you need to do is to copy the code between the noscript tag which can be found under your conversion code. This is a backup code when page doesn't support javascript.

Then paste it on your thank you message, source code window. Example:

On a side note, you may want to consider the Jotform Form Analytics https://www.jotform.com/form-analytics/.

Thanks!