How can I add units of measure to my products on Shopify?

[SmeadDev]

Hello,

I seem some replies on how to add UOM to products, but I don't see the "show unit price for this product" in my products portal when I click on a variant and scroll down to the pricing section. Is this option only available to certain Shopify tiers? If so, how can I set up UOM for our products.

Instructions I am referencing: