The standard 1.8V n/pfets in the new xschem symbols have values automatically populated:

XMpasspba net2 OUTp VDD VDD sky130_fd_pr__pfet_01v8 W=1.5 L=0.15 ad='W * 0.29' pd='W + 2 * 0.29' as='W * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 nf=1 m=2

XMpassnba net3 OUTp GND GND sky130_fd_pr__nfet_01v8 W=1 L=0.15 ad='W * 0.29' pd='W + 2 * 0.29' as='W * 0.29'
+ ps='W + 2 * 0.29' nrd=0 nrs=0 sa=0 sb=0 sd=0 nf=1 m=1