How do I use rust quote library for a procedural macro that generates a new struct type

Question

I have a struct like this:

struct Input {
   key1: u32,
   key2: String,
   value1: u16,
   value2: u8
}

I want to write a proc macro using quote that generates this struct:

struct InputKey {
    key1: u32,
    key2: String,
}

How do I do this?

The most I could figure out is this:

let ident_key_type = quote::format_ident!("{}Key", ident);
quote! {
    pub struct #ident_key_type {
    }
}

This is creating an empty struct.

I am unable to figure out how to write a for-loop to iterate over the 2 key fields "Key1" and "key2" and add those 2 fields to the InputKey struct.

My code uses the quote library so I would prefer a solution that uses that.