Adding a Custom Chart Label

I have to create a chart like this:
Cattura

I have to create 2 custom labels near the graph. How can i do it? Thank you very much

You can use 3rd party Chart apps like HighCharts or amCharts to generate Funnel Chart in CRM. See below chart that was created using Custom Entry Point and HighCharts.

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Or a Google Charts way, see here

It takes a bit of coding, I post full source code there so you can adapt to your needs.