Passing different CDF parameters values to instance arrays

Hi,

I'm trying to pass different transistor lengths/widths to an array of nfet devices MN0<2:0>. I tried passing "[100n 200n 300n]" in the length field of the nfet property window as suggested here: https://community.cadence.com/cadence_technology_forums/f/38/t/20875

but Spectre returns a warning: Invalid value '[100n200n300n]' of type `scalar string' encountered. Expected value is of type `double' and the wrong W/L values are used.

Is there a way of achieving this?

Thanks,

Patrick