Is it possible to create a Cupids's bow on the lip if you had bilateral cleft lip? Any advice on reducing my scars? (Photo)

That is a beautiful surgical result. The scars have created a cupid's bow.
I would recommend that you consider permanent makeup. Your lips could be delicately outlined in pink and this could be used to make the right peak a little higher to match the left and it could be used to create a vee between the peaks. Permanent makeup matching your skin tone could be used to pigment the scars between the lip and the nose so that they are less visible.
The firmness of the tissue would encourage filler to flow to the unscarred areas. This is likely to make the scars more apparent.
Good luck to you.

Tracing all these structures with volume will only call attention to the presence of scars.  You need an artful injector.  This is more challenging than injection unscarred tissue.  Do your homework on the injector.  I think properly done, you will be very happy with the improvement.  I would focus on the lips including the cupid's bow but not the philtrum and especially not the philtral ridges.

Yes, a cupid's bow can be created with well-placed fillers. Technique will be important here, so you'll want to see someone meticulous. I recommend getting a formal evaluation with a facial sculpting expert. Best, Dr. Emer