Add a cell area to a conditional formatting rule in an Excel worksheet using Aspose.Cells Cloud REST API (v3.0). Includes endpoint, parameters, cURL, SDK examples, response schema, and error handling....Description cellArea string Yes Cell range to add, in A1 notation (e.g...format – Must be a valid A1 range ( A1 , A1:C3 , Sheet2!B2:D5...