ZoomCharts doesn't have any limitations. The only limits that we are aware of is Power BI limit of how many records can be passed to charts. If I'm right, then it was 50k or something.
If you see a mark somewhere on the visual that says: "Too many values. Please filter data." or something like that, then it's an error coming from Power BI. We can't do anything about it.
Power BI truncates data and sends limited amount of data to visuals. So ZoomCharts visuals receives data that Power BI sends.
Hope it helps.