Swagger 2.0 how to define vendor response content type

Hi All,

I needed the ECB API below but my company tools only support swagger 2.0. Because of that I had to convert the below docs from swagger 3.0 to 2.0(both in yaml). When I test using the swagger UI I am able to define the response content type which are vendor specific. However inside our tool the response content type is not being recognized. I am wondering if the APImatic conversion of my swagger doc has been affected.

sdmx-rest/sdmx-rest.yaml at master · sdmx-twg/sdmx-rest (github.com)

Attached is the converted swagger documentation