Open your App Catalog (check out the Installation section if you don't know where your app catalog is).
Select the 365Automate solution, click the Files ribbon menu and select Sync to Teams:
In Teams, you can now add a Chart tab to a channel.
Navigate to the Team/Channel you want to add the chart to, and click the Add a tab button:
Select the 365Automate Chart option:
You'll be shown a final confirmation. Click Save.
A blank chart will now be added to your Team. At this point, you may continue to configure the chart as normal.