Here are the classes, structs, unions and interfaces with brief descriptions:

CJxlAnimationHeader
CJxlBasicInfo
CJxlBitDepth
CJxlBlendInfo
CJxlChunkedFrameInputSource
CJxlCmsInterface
CJxlColorEncoding
CJxlColorProfile
CJxlDecoderDestroyStruct	Struct to call JxlDecoderDestroy from the JxlDecoderPtr unique_ptr
CJxlEncoderDestroyStruct	Struct to call JxlEncoderDestroy from the JxlEncoderPtr unique_ptr
CJxlEncoderOutputProcessor
CJxlExtraChannelInfo
CJxlFrameHeader
CJxlHeaderExtensions
CJxlLayerInfo
CJxlMemoryManagerStruct
CJxlPixelFormat
CJxlPreviewHeader
CJxlResizableParallelRunnerDestroyStruct
CJxlThreadParallelRunnerDestroyStruct