script.cs

using System.Runtime.CompilerServices;
using UnityEngine;

public class MyScripty : MonoBehaviour
{
    void Start()
    {
        var writer = new SingletonWriter<MyStruct>(new MyStruct() { Int = 1 });

        var val = writer.InspectMe; // Set a breakpoint here and inspect "InspectMe" with your mouse hover

        Debug.Log($"Ahoy {val}");
    }
}

public sealed class SingletonWriter<T>
{
    private T _value;

    public SingletonWriter(T val)
    {
        _value = val;
    }
    
    public ref readonly T InspectMe {
        [MethodImpl(MethodImplOptions.AggressiveInlining)]
        get => ref _value;
    }
}

public struct MyStruct
{
    public int Int;
}