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You can do this by using the sub-matcher format of

matchesJsonPath

along with one of the date matchers. Something alone these lines:

"bodyPatterns": [
            {
                "matchesJsonPath": {
                    "expression": "$.completedDate",
                    "equalToDateTime": "2023-01-01",
                    "truncateActual": "first day of month"
                }
            }
        ]