History backlog chart of GutHub issues

I have an index where I'm dumping the information from a GitHub repository that I want to create a chart to view the opened, closed and backlog (opened - closed) issues by date to view the progress.
I have the fields created_at and closed_at (that can be empty for opened defects).
How can I do this in a kibana visualization?

Hi Oscar. I don't think we have enough information to help you with this. Can you explain in detail how the visualization should look?

I was able to do this by using timelion chart.
Here is what I was looking for:

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