Thank you for this idea - I am checking with our team to confirm where the best place to ask OSSI-related questions will be, whether that be a category here like you suggested or elsewhere.
I will also report back with an answer to your question… stay tuned!
I’ve added a category for OSS Index and moved this topic there. Thank you! Still working on getting an answer to your question as well.
EDIT: In answer to your question, at this time, support for vulnerabilities with multiple CWEs is not planned but I will certainly post here if this changes.