Preparing a Form - multi-line Text Field, non-rectangular

Is it possible to have an unevenly shaped text field? I'm preparing a form into a fillable PDF. The form is from an Insurance company so I can't edit the overall structure. They have a place to type multiple lines for the same field, but the prompt takes up a portion of the first line. So if I want to have that be one text field, I need a smaller text field on the first line and a larger one on the second line. But I'd like to make it one field if possible. 

I've provided an image of the portion in question below. I would like those two text boxes on separate lines to be as one field. If that's even possible.

Thanks