I found a solution that ought to work soon:
Create a second variable called ‘formatting’. Then go to your drop-down and for each of your KPIs click “Add another variable”. Set the variable “formatting” to “.2%” for ratio (if you want to than 2 decimal points just change the 2 to a different number). If you want your Volume KPI to have the format “#.##k” then set formatting to “.3s”.
As a next step you would go to your dynamic KPI and write “<%= formatting %>” in the box next to “Format”. Unfortunately, this step currently doesn’t work properly as Format doesn’t yet accept variable inputs.
I have made a service desk ticket reporting the bug to our delivery team on your behalf so this solution should work as soon as they have fixed that. Please be patient with us. I will let you know if I have more information for you.