@Likhitha You can only try to use the custom formatting --> Format by: color scale and choose colors for Minimum and Maximum values. The danger is that depending on the total values, more than one columns can be highlighted as the maximum.
Your demand is a good idea, while it is not supported to set conditional formatting for line and clustered column chart in Power BI currently. You can post your new idea in Idea Forum , to improve the Power BI.
It is a place for customers provide feedback about Microsoft Office products . What’s more, if a feedback is high voted there by other customers, it will be promising that Microsoft Product Team will take it into consideration when designing the next version in the future.
If this post helps, then please consider Accept it as the solution to help the other members find it more quickly.