Converting only chosen rows to %

DaxTrader 

if this column is a measure, you can try dynamic format

https://learn.microsoft.com/en-us/power-bi/create-reports/desktop-dynamic-format-strings?wt.mc_id=DP-MVP-5004616

Hi DaxTrader,

Thank you  for reaching out to the Microsoft fabric community forum.
I would also take a moment to thank  ryan_mayu , CPCARDOSO , Greg_Deckler , rajendraongole1 for actively participating in the community forum and for the solutions you’ve been sharing in the community forum. Your contributions make a real difference.

In Power BI, column formatting works for the whole column, so there is no direct option to format only a few rows differently. The workaround is to create a measure and use a DAX expression with SWITCH(). This way, if the row is one of those three KPIs, it will show as percentage, and for the rest it will stay as numbers.

So with this approach, values like 0.02 will display as 2%, while the other values remain unchanged

I tested it with  sample data, and it worked fine. Please find the attached Pbix for your reference.
Hope this helps if you have any queries we are  happy to assist you further.
Best Regards,
Harshitha.