We're glad to hear you're listing the Insights page! The Insights page currently shows contact growth. The chart you've suggested sounds like you might be interested in see your email performance over time? What's getting more opens, clicks, etc? If that is the case, you might be interested in using the Graph option on the Reporting page. It's a great way to compare email performance over time and see what' getting the best response.
If I misunderstood and there are some charts you're wanting to see on the Insights page please let me know!
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