"As entered" means that no data formatting will be applied to the field type layout object for which you select this data formatting. Note that this specifies a display format for a field on your layout, not data in your chart--which is why that option doesn't work for you.
Here is a calculation you can try. If it doesn't work for you , please indicate why it doesn't work as there are a number of ways to tweak it:
let ( [ N = YourTable::yourField ;
i = Int ( N )
"$"& i & "." & Left ( ( Round ( N ; 2 ) - i ) * 100 & "00" ; 2 )
You may have to leave out the $ in order for this to chart correctly. I've check the expression in my data viewer, but haven't tried to use it in a chart.