Measurement Price Calculator – Add extra value on measure

Hi, there!
I’m using the Measurement Price Calculator in a woocommerce project, and I need to add one more dropdown list for fraction values, as 1/2, 1/8, etc.
For each measure (Lenght & Height), I need two drop downs, one for full values, and other for fraction. I did not found anything that can do that. Any help, please?
Thanks.