Extract layer definitions from sublayers of a namedmap
Extract layer definitions from sublayers of a namedmap

Like for a layergroup

codeandtheory/cartodb,CartoDB/cartodb,splashblot/dronedb,codeandtheory/cartodb,CartoDB/cartodb,codeandtheory/cartodb,codeandtheory/cartodb,splashblot/dronedb,CartoDB/cartodb,bloomberg/cartodb,splashblot/dronedb,bloomberg/cartodb,bloomberg/cartodb,splashblot/dronedb,splashblot/dronedb,bloomberg/cartodb,CartoDB/cartodb,bloomberg/cartodb,CartoDB/cartodb,codeandtheory/cartodb