Hi Nikil,
Currently, there is no way to adjust the Scale (units) on a Chart, there is an idea on SAP BI Ideas, you might want to vote on it.
Also, apart from scale adjusting itself depending on the value, it also depends on the height of that Chart, increase the Height of the Chart and you'll see what I'm talking about. You'll see more ticks when you increase the height.
Check out the scale in the below pic, its 0, 50, 150, 200.
And now when I increase the Height of the Chart, the scale now has more values (ticks), 0, 20, 40, 60, 80, and so on.
Thanks,
Mahboob Mohammed