This datapack allows you to breed polar bears.

To breed a polar bear, simply drop a piece of raw cod at the location of the polar bear. This will make it ready to breed. Two polar bears that are ready to breed must be within 5 blocks of each other to breed together. Once prepared for breeding, they will remain in that state for 120 ticks or 60 seconds unless they are bred in which they will lose the status at the point

This datapack was graciously created by Retro#1517 for me, and he was kind enough to allow me to upload it here. His Discord is @Retro#1517. If you have any questions feel free to contact Retro or I!