
I am using LineAndShapeRenderer and SymbolChart for the Oy-axis in order to rewrite the items-labels on the Oy axis.
Below is the chart I already have.

What I want are the following 2 things:
1) shift down the Oy values in such a way that the "VERY LOW" label, which corresponds to the zero-value, reaches the Ox axis;
before using the SymbolChart, the 0 values was exactly on the Ox axis!
2) keep all the items that have the same value on the Ox-axis between 2 vertical gridlines/shift a bit the gridlines in such a way that
all items with the same value on Ox are in the same "gridlines range"
The desired chart looks like the one below:

TIA for any hints/ideas!
All the best.