Is it possible to get a list of axis label strings to change LabelFormatter property based on it?

I need to synchronize two plot areas to share the same X axis. 

As long as I do not need pinch zooming, the idea is setting Y axis labels to an equal length.

Unfortunately, I cannot find out what will actually be rendered so I do not know "how many whitespaces to insert".

Is that possible with this library?

P.S. Or I should go with "using as single plot area" + "tweak the dataset and labels in the upper part".