We determine the rational Chow ring of the universal moduli space of rank 2 semistable bundles over smooth curves of genus 2, and show that it is generated by certain tautological classes. In the process, we obtain Chow rings of universal Jacobians over genus 2 curves with marked Weierstrass points, and the Chow ring of the universal pointed Jacobian. This further provides alternate computations to arxiv: 2404. 12607 in the genus 2 case.
Shubham Saha (Mon,) studied this question.