how to sendjson data to sql stored procedure using biztalk/how to call json send pipeline in orchestration

Question

i hav a requirement,
i need to call awebserive which has 3 methods,
1)encript
2)datapush
3)decrypt

first i need to call encrypt method , the input to this method is json string:
{
"RequestString":{
"Policy_No":" POLICY_NO",
"Policy_effective_date":"13/06/2020"
},
"confirmation_mode":"plcy",
"Source":"abc",
}

now i cant send directly json to encrypt method, its a soap service with parameter string of jsondata,
so please help me how to hadle this.

also please help how to call json send pipeline in orchestration , bcoz output of encrypt method need to be passed to push data.

Please suggest.