Proc_macro_derive send operator as parameter

In my proc macro I want to use pass in an operator for an equation such as

obj1.as_i64() > obj2.as_i64();

where the > is a value passed on.
used something like this

pub struct GreaterThan(String);

what I would like to know is how could I define the parameter, get the parameter and use it in place of the ">"

Derive macros don't support direct parameters like that. But you can use a helper attribute

so you could write stuff like

pub struct GreaterThan(String);

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