[BUG] Dart code (seems to) need dartson

Created by: ExplicitlyImplicit

When using enums it seems that the generated dart code references stuff in the dartson package:

https://github.com/OpenAPITools/openapi-generator/blob/b186883217577a2db87789d3efe8f18f4e712023/modules/openapi-generator/src/main/resources/dart2/api_client.mustache#L50

https://github.com/OpenAPITools/openapi-generator/blob/b186883217577a2db87789d3efe8f18f4e712023/modules/openapi-generator/src/main/resources/dart2/enum.mustache#L1

https://github.com/OpenAPITools/openapi-generator/blob/b186883217577a2db87789d3efe8f18f4e712023/modules/openapi-generator/src/main/resources/dart2/enum.mustache#L18

But it does not include it in the pubspec.

Is this by design and how can I fix it?

Thank you for your help!