Dictionary of dictionaries, each with multiple keys?

You originally asked the question:

Your response implies that what you’re looking to create is:

But what you’re generating is:

So no, based on the information posted here so far, I’d say you’re heading off in the wrong direction.

However, I will also add -

That statement is not globally accurate. Different charts accept different formats of data. Which type of chart are you looking to create?

That is, at best, a misleading statement. They serve different purposes and do different things - pick the right tool for the right job.