"detailInputs": [
    {
        "name": "SOGrid",
        "repeatingInputs": [
            {
                "inputs": [
                    {
                        "name": "ItemNumber",
                        "value": "XYZ"
                    },
                    {
                        "name": "Quantity",
                        "value": "1"
                    }
                ]
            },
            {
                "inputs": [
                    {
                        "name": "ItemNumber",
                        "value": "ABC"
                    },
                    {
                        "name": "Quantity",
                        "value": "1"
                    }
                ]
            }

using (var conn = new OleDbConnection(connectionString))
        {
            sheetName = "Detail";
            conn.Open();
            var cmd = conn.CreateCommand();
            cmd.CommandText = $"SELECT * FROM [{sheetName}$]";

            using (var rdr = cmd.ExecuteReader())

            {
                var query = rdr.Cast<DbDataRecord>().Select(row => new {
                    name = row[0],
                    value = row[1],
                    //description = row[2]
                });

                var json = JsonConvert.SerializeObject(query);
     jsonArrayString = jsonArrayString + ","detailInputs":[{"name":"SOGrid","repeatingInputs":[{"inputs": " + json + "}]}]}";

using (var conn = new OleDbConnection(connectionString))
        {
            sheetName = "Detail";
            conn.Open();
            int counter = 0;
            var cmd = conn.CreateCommand();
            cmd.CommandText = $"SELECT * FROM [{sheetName}$]";
            var values = new List<Dictionary<string, object>>();
            var ListValues = new List<string>();

            using (var rdr = cmd.ExecuteReader())

            {

                while (rdr.Read())
                {

                    var fieldValues = new Dictionary<string, object>();
                    var fieldValuesList = new List<string>();

                        for (int i = 0; i < rdr.FieldCount; i++)
                        {
                            fieldValues.Add(rdr.GetName(i), rdr[i]);
                            fieldValuesList.Add(rdr.GetName(i));
                        }

                    // add the dictionary on the values list
                    values.Add(fieldValues);

                }