Is there a way to make the ASM DoS Profile in "transactions per minute"?

I am being asked to create a CAPTCHA challenge rule whenever a IP makes more than 5 transactions per minute. I see in the DoS Profile options there is a Source IP with a CAPTCHA option, but the rule is by transactions per second. Is there any way that I could change that to per minute, or is that not an option with the default Profile? Thank You!