lineChart two DataSets，How can i change the y value offset of only one of them and not the other

[15574946385]

refer to this https://github.com/PhilJay/MPAndroidChart/issues/1509

use LineChartRenderer I am able to modify the position of the y value, but found that the positions of both polylines are modified, how can I modify it for individual values

like this

One line's data is on top, one line's data is below