If i set 'mult=2 in the edit attribute i get in netlist:

XM1 net1 G1v8 S B sky130_fd_pr__nfet_01v8_lvt W=1 L=0.15 ad='W * 0.29' pd='2 * (W + 0.29)' as='W * 0.29'
+ ps='2 * (W + 0.29)' nrd='0.29 / W' nrs='0.29 / W' sa=0 sb=0 sd=0 nf=1 mult=2 m=2