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Unfortunately the short answer would be no.
There are of course alternative ways that would allow you to do this.
1st - using 2 forms, one for donation and another with products
2nd - using the fields to capture everything and just pass the value to the payment processor
Depending on how you want to set your form up, one of the two might be preferable to you over the other, but here are the guides that will show you how to setup each:
Of course, if you have any issues setting it up, or some questions along the way, we are here, so feel free to let us know of the same :)