Is there a way to set values as percentage?

Hi i need to create a chart like the image below. I create a pie chart with a hole but i am unable to set one value because i couldn’t find a way to set the value as percentage. If i give just one value library automatically calculates as %100.

Another question; is there a way to show the values outside in a pie chart with a line like the image below? I know i can set the position as outside but it doesn’t draw lines.

Screenshot from 2020-06-26 14-48-46

Thank you so much!