How to do "Layer Map" by name

Hi,

In SVRF, "LAYER MAP" could be used to map layers from GDS input to Calibre layer numbers, such as:

LAYER MAP 1 DATATYPE 0 10

where "1" is the original layer number in GDS input. However, this layer has its original layer name as well (e.g. 'poly'). Is there any way to do layer map by this name? Such as:

LAYER MAP 'poly' DATATYPE 0 10

Thanks!