We have just released v1.9.6 Beta with Methods & Properties, which allows you to programmatically export chart as image, print chart, access internally calculated values, etc. Please refer to the release blog for more information.
We currently don’t have a way to access minimum and maximum values that are auto calculated. At the same time we think the chart should not override the values initially set by the user while zooming – which defeats the purpose of setting minimum and maximum (by users). Hence we don’t intend to implement the same.