I have seen many times that freelancers were used for this purpose. There are many sites that you can find on request "writing lyrics freelancers". I am sure you will find someone who will help you in this matter.
I've found a few good ones in Reddit and also I am on a Whatsapp group and there everybody is down to collab. You can actually find them in so many places but finding a good one. I had more luck on Whatsapp.