I'm guessing you'd have to stiffen the fabric, do the embroidery then cut out the shirt front.
Being new to embroidery I don't understand cutting out the pattern or shirt part. I hooped the part of the shirt I wanted to embroider on. DD wanted a design on a shirt pocket. I said fine but you won't be able to open the pocket. I'm not going to that much trouble to put a flower on a shirt. I stiffened the shirt pocket part, put in hoop, used variegated thread and done in 2 min. My machine is not a fancy one. It is a Brother 8500 D.
I'm surprised many don't know about the spray. I've seen guild members use it for their embroidery for some years now. Some members use it for the Scan and Cut machines to make the fabric stiff for cutting. One member said her DD uses it to shape elaborate hair do for wigs for her theater group.