Group the delinquent transactions while sending dunning letter for Trx level strategy

Summary:

We are using strategy at transaction level but we want to group the delinquent invoices into a dunning letter for the same customer for the same day dunning letter delivery as we do not want customer to receive two different dunning letter but a one with both past due transaction.

Is it possible to achieve this?

Currently system sends different dunning letters for each delinquent Trx.

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