@User, i can confirm i see the same issue, but only if using batch simulation. If you configure xschem to use interactive sim (Simulation->configure simulators and tools, ->ngspice) AND if you set up your simulation this way:

.options savecurrents
.control
  save all
  op
  ac dec 10 1000 1000G
  write <your_circuit_name>.raw
.endc

then you will have your gate currents:

8       i(@m.xm1.msky130_fd_pr__nfet_01v8_lvt[ib])      current dims=0
        9       i(@m.xm1.msky130_fd_pr__nfet_01v8_lvt[id])      current
        10      i(@m.xm1.msky130_fd_pr__nfet_01v8_lvt[ig])      current dims=0
        11      i(@m.xm1.msky130_fd_pr__nfet_01v8_lvt[is])      current dims=0