Applying default colour to multiple line charts expected the selected line chart.

Hi Team , 
I had a line chart which has more than 50 lines (those lines are subject to change ) in it.  As by default , the lines will have different colour for each  , so clicking on a particular line will highlight it and partially shading the other lines . Understanding data  or trend from  the selected is very low as all other lines are also coloured.

Solution that i am looking for is that only the selected line ( or lines ) should be in coloured and other should be shaded out in same light coloured. 

Current Image  :-
Selected Legend is highlighted and other  legend are partially shaded out in their default colour - Difficult to grasp the data points from the selected line  in this kind of UX

Expected Image :-
Selected Legend is highlighted in its own colour and other legend are partially shaded out in a single default colour -  Easier to grasp the flow and can  quckily understand the data points 

Tried solution :- 

1).  Implementation of  two widget approach (one overlap the other ), underlying widget will contain all legend in a single light colour and overlapping widget  will have only the API's selected from slicer which will be in different  coloured  (Reference Link 1/ Reference Link 2    )  - Only pre-defined and static number of lines chart are supported , for dynamically changing line chart this wont work.

2). Implemtation of custom theme , creating a new custom theme with default colour for line chart as mentioned in this community post - Only the pre-defined and static legends are alway highlighted , but in our requirement we will select the legend dynamic and only those to be highlighted.


Any direct or alterantive workaround or any pointor will be really helpful.