Enable label position as percentage of the size #553
Description
Sometimes the start, center and end position could be the best options to position a label.
Maybe you would like to put it a specific position of the line.
To address the above cases, you could implement to set the position as percentage of the size.
position : 'start' | 'center' | 'end' | number | string
The number could be a value between 0 and 1 or a string with % (i.e. '25%') which represents the percentage of the size.