Is your feature request related to a problem? Please describe.
Although the bundle config can be yaml files which support inline commenting (starting a line with #), the json config couldn't include any comments or descriptions.
for example https://github.com/Project-MONAI/tutorials/blob/main/modules/bundle/spleen_segmentation/configs/inference.json is not very straightforward to understand.

This is a feature request for keyword _desc_, in addition to the existing ones

so that the users can provide some free text comments without breaking the config components.