Fluent Validation, different validation for each item in a list in Asp.NET Core

I´ve been trying to find a way to validate items inside a list, each with different validation rules. I came upon Fluent validation which is a great library but I can´t seem to find a way to do validation for each item individually. I got a faint idea from this similar thread (Validate 2 list using fluent validation), but I´m not sure how to focus it how I want.