Variable in AST query?

[Valayil Abraham]

I would like to pass a variable into an AST query in my powershell script. eg. in the query below I would like to use $role instead of "avrt". Is it possible? Getting an error when I tired it.

$trusted_facts = @{

  query = '["from", "facts",

  ["and",

    ["=", "name", "trusted"],

    ["subquery", "facts",

      ["and",

        ["subquery", "fact_contents",

          ["and",

            ["~>", "path", ["trusted", "extensions", "pp_role"]],

            ["=", "value", "avrt"]

          ]

        ],

        ["subquery", "fact_contents",

          ["and",

            ["~>", "path", ["trusted", "extensions", "pp_apptier"]],

            ["=", "value", "production"]

          ]

        ]

      ]

    ]

  ]

]'

}