Is it possible to add one
Yes it is. Your options are cartilage graft or implant. I don't think you would be able to get sufficient cartilage from your ears so you would be looking at rib cartilage. If you go the implant route you should decide between silicone, medpor and goretex. Each option has its pros and cons. Cartilage can warp. Silicone can shift out of position etc.
When you see the surgeon you should also decide whether you want the base of the tip narrowed or the dome less round as these options are also available to you.
It is possible to add or reconstruct the bridge through cartilage, or fillers. See a series of surgeons in consultation for the best advice.
We create nasal bridges that provide consistently aesthetically excellent contours using organ donated rib graft. The secret is to dice the cartilage and wrap in a fascia to create a burrito like graft. This graft is superior to traditional techniques as it provides a stable construct without the concern of future warping. A consultation with a nasal specialist would help you appreciate the details of this surgery and fees involved.