There is an issue with setting the Font in the designer, but for the Label color open the Options Editor and navigate to Scales > yAxes[0] > ScaleLabel > Color
You can still set the Font Size programmatically.
If you want smooth curving lines I believe you’re referring to the LineTension property, which can be found as a property of the ChartJS DataSet.
Please let me know if you have any issues with this!