Tensorboard per class mAP score logging for validation

[Robotatron]

It seems mmdet and TensorboardEvalHook do not automatically output per class instance segmentation COCO mAP scores for validation, only aggregated mAP for all classes. In Detectron 2 per class mAP is logged automatically as well. Is there an easy way to enable this? To show COCO validation per class, e.g. for apple, orange, etc.