How to set up a numeric field for an attribute in WooCommerce and add a unit of measurement?

Question

Online shopping

In WooCommerce, the fields for attributes are initially text, how can I set them to numeric?
To sort later using a standard filter as in the price, and not with checkboxes, or a drop-down list, as for text fields.
And for the numeric field, you need a field for the unit of measurement,
for example:
Power: 30 W
Area: 100 m2