Need date in "dd-mm-yyyy" format in JSON

I need to give date in "dd-mm-yyyy" format in REST API. But the API response always comes in "yyyy-mm-dd" format even if i changed the format of date field to "99-99-9999". It seems it always gives date in ISO 8601 format no matter what format i choose.

I checked session:date-format and it's already dmy. "write-json()" method also has the same problem. But i only need it in REST webservice. Progress verison: 11.3.

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