Visualization on document containing list

I have searched in the forum but could not find the relevant discussion.

If a document contains a field which is a list of values (e.g. ['p', 'q', 'r']), then this field cannot be chosen as a term for visualization?

No because it is not a term, it is an array.

I'm not sure if this can be graphed.

Thanks. After quick search with 'array' keyword, I found this, but need time to see whether it is useful for my case:

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