How to collect 2 payments on one form?

I would like an option to donate or except raffle tix payments on the same form

It is not possible to have two payment options such as product and donation inside of one payment field on the form. 

However there is possible workaround. You can set your fields outside of payment field using basic field such as textbox, chackbox, number field, etc. Then you would need to assign values to those fields and to perform calculation inside of the form. Finally you will need to pass calculation to your payment field. This guides can help you to achieve this:

How to Assign Calculation Value

How to Perform Form Calculation Using a Widget

How to Pass a Calculation to a Payment Field

You can also check this thread where my colleague provided detail explanation how this can be done: https://www.jotform.com/answers/601808 

Hope this will help. Let us know if you need further assistance.