Cycles and GN:Disable shadow by setting material Or trun off shadow seletion mesh to turn of

sometimes using GN to get some complex object but want to disable part or shadow by object in cylces render

But I Can·t do it because i can only diasble whole object`s shadow by setting raytracing->shadow option.

so.need some feature to do it: 1.by material ->turn off shadow 2.by GN-->disable shadow seleltion mesh.

qustion： yes，i don·t want to separate the node content(disable shadow mesh) as independent object.