[
    {"keyName": "var1", "sourceTable": "computed", "sourceColumn": "getRmContactUserName", "dataType": "string", "isNullable": false},
    {"keyName": "var2", "sourceTable": "hdb_program_registration", "sourceColumn": "full_name", "dataType": "string", "isNullable": false},
    {"keyName": "var3", "sourceTable": "computed", "sourceColumn": "getUserFormattedPhone", "dataType": "string", "isNullable": false},
    {"keyName": "var4", "sourceTable": "computed", "sourceColumn": "formatAllocatedProgramDateRange", "dataType": "string", "isNullable": false}
]