'JBPM Decision table to count values in an array

I am new to jBPM. I'm trying to set up a guided decision table via Business Central.

My request data looks like this:

{
    "Person": {
        "id":1234,
        "numberOfDoses":null, 
        "vaccineDoses": [
            {"manufacturer":"Pfizer", "doseDate":"2021-07-01"},
            {"manufacturer":"Pfizer", "doseDate":"2022-01-01"},
            {"manufacturer":"AstraZeneca", "doseDate":"2022-04-01"}
        ]
    }
}

The response should be

{
    "Person": {
        "id":1234,
        "numberOfDoses":2
        "vaccineDoses": [
            {"manufacturer":"Pfizer", "doseDate":"2021-07-01"},
            {"manufacturer":"Pfizer", "doseDate":"2022-01-01"},
            {"manufacturer":"AstraZeneca", "doseDate":"2022-04-01"}
        ]
    }
}

I need to set up data model(s) and a guided decision table to count number of doses received in 2022. I have tried with two data models Vaccine and include Vaccine in Person as a list. Didn't work. Can someone shed some light on how to access sub fields and iterate through the array to count the number of doses?

jbpm


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