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How are you with "C" code?
It's possible to work back from the field definitions in the code to where they are set to a value.
You would start here and work back to where value is set: epan/dissectors/packet-ptp.c:

        { &hf_ptp_v2_analysis_sync_period,
          { "measuredMessagePeriod", "ptp.v2.analysis.sync.measuredMessagePeriod",
            FT_DOUBLE, BASE_NONE, NULL, 0x00,
            NULL, HFILL }
        },

Or you can try contacting the author/contributor by adding a comment to the merge request:
5929: PTP: Analysis of Message Intervals (Sync and PDelay_Req)