wchtools supports a --by-type-name option.

This limited pull option allows you to pull all content associated with a specified type name, along with assets directly referenced by that content, in image and video elements, and referenced renditions.
(https://github.com/ibm-wch/wchtools-cli#pulling-content-by-type-name-along-with-assets-directly-referenced-by-image-and-video-elements-and-renditions-directly-referenced-by-that-content)

File assets are not supported today. This item is about supporting file assets in the same way as image and video assets.