Is your feature request related to a problem? Please describe.
Bundles can be specified to depend on optional packages through the optional_packages_version in metadata.json. Some bundles may require certain packages so a required_packages_version may be needed, or a change in name for optional_packages_version.

Describe the solution you'd like
Some way of specifying what packages other Pytorch, Numpy, and MONAI are needed by a bundle.

Describe alternatives you've considered
I've used optional_packages_version to specify needed packages but this doesn't seem adequate.