Any suggestions to solve shielded jumpers between different PCBs?
If both PCB are on the same plane, you can use small PCB to PCB connector, and design a small PCB which has the right shape to get to where you want.

You can do a 3 layers PCB with the outer layer being the shielding and have the traces in the inner layer.

Otherwise you might look at cable assemblies for laptop screen, usually they are shielded cable attached to the PCB.