What is JotForm?
JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I see that you have already added it to the autoresponder email and that is easily done by just typing it to the reply-to field in your Autoresponder email template.
Now if you want to do the same for your Email Notifications, the way to do it would be to add some field, like Text Box field
One you have it on your jotform, just add the email address as the default text / Default Value:
We do that by clicking on the Text Box field and then clicking on the Default Value option in the toolbar. Once we type the email in the small field that just opened we must click on OK and that is it - we have just set up the default value.
Now we should hide it so that the email is not shown on the form to everyone:
The field should be still selected for us, but if not, we just select it again and click on that little gear wheel at the top right part of it and then click on Hide Field option in the new popup menu.
Once we have it hidden like that we just select it from the dropdown in our Email notification template:
Do note that "reply-to email" is the name of the field, so depending on how you name that hidden field a different option might be shown to you than the one on the screenshot.