read deserialise json data in Dictionary with value as Dictionary in c#

Hi,

I'm trying to desirealise the json data from a external file where i want to read the key and fetch another dictionary value based on key please letme know if i can read dictionary inside dictionary , I have tried using DIctionary<string,object> where as am looking for Dictionary <string,Dictionary<string,string>> format to read the data
sample json data :

                  {
       "PSQL": [
                {
                  "isClient": "\"SELECT  RULE_T FROM TABLE_TEST WHERE USR_ID = 'XYZ' AND PROD_ID = 'V'\";"
                }
              ]
            }