Rocket pods, take it or leave it
On a more serious note the hatch and its bulge is imo the biggest mystery on the J-XDS rn. It can be just a service hatch like the one on the J-35 with a bulge for ECM antenna maybe, or it can be a bay for small CUDA-like AAMs, or something even fancier. I for one want to wait and see before deciding on what I think it is, since currently there is so little information to go off of.
as to diagonally inserting SRAAMs in there, I feel like that will eat away space for the main landing gear and intake, making it really awkward in terms of internal space usage. Also if they really wanted a side weapon bay they could have just designed a longer intake manifold to accommodate a full-size door akin to J20’s design, instead of making a very complicated attempt at reducing bay door length