Hi @kankdekar,
If your requirement is to assign role for bulk users, you can utilize sailpoint provided ruby script (IdentityNow Bulk Access Profile and Role Importer - Compass).
But if requirement is for revoking you can utilize access request API (create-access-request | SailPoint Developer Community)
You can refer to similar post here: Create Bulk Access Requests in ISC - Identity Security Cloud (ISC) / ISC Community Knowledge Base - SailPoint Developer Community