Number of digit in a decimal number in a label

I’d like to know if there is a way to adjust the number of decimal digits in a line label? (as in Excel for example for decimal numbers). I am using Omnigraffle 7.2.2.
For example, I draw a line with a line length label. This label indicates 10,0412 cm. It is too much precise for my needs. A length label as 10,04 cm would be enough.
Thanks in avance for your reply.