Add product SKU in GA4 dimension

Hello all,
In Universal Analytics, Product SKU is one of the dimensions that sit under E-commerce interface. However, Product SKU has been taken out as a pre-set dimension in GA4.
So now, what would be the best way for me to add it back in GA4? I have set up GA to connect with Shopify store. After created a new custom dimension for Product SKU in GS4, do I have to do some setting / add on coding on the Shopify store too?