using NaughtyAttributes;
using UnityEngine;

public interface IMyInterface1
{
}

public class MyComponent1 : MonoBehaviour
{
    [RequiredType(typeof(IMyInterface1))] //make sure given GameObject has component with specific interface
    [SerializeField]
    private GameObject myObj;

    private void Start()
    {
        var myInterface = myObj.GetComponent<IMyInterface1>();
        //do something
    }
}

using NaughtyAttributes;
using UnityEngine;

public class MyComponent2 : MonoBehaviour
{
}
public class MyComponent3 : MonoBehaviour
{
}

public class MyComponent1 : MonoBehaviour
{
    [RequiredType(typeof(MyComponent3))]//make sure given myComponent2 also has MyComponent3 too.
    [SerializeField] private MyComponent2 myComponent2;
    
    private void Start()
    {
        var myComponent3 = myComponent2.GetComponent<MyComponent3>();
        //do something
    }
}

using NaughtyAttributes;
using UnityEngine;

public interface IMyInterface1
{
}

public class MyComponent2 : MonoBehaviour
{
}

public class MyComponent3 : MonoBehaviour
{
}

public class MyComponent1 : MonoBehaviour
{
    //make sure given component has a component that Inherits IMyInterface1
    //make sure given component has MyComponent3 component
    //Note: They can be different components (one has MyComponent3 other one has IMyInterface1)
    //or same component (if MyComponent3 inherits IMyInterface1)
    [RequiredType(typeof(IMyInterface1), typeof(MyComponent3))]
    [SerializeField]
    private MyComponent2 myComponent2;

    private void Start()
    {
        var myComponent3 = myComponent2.GetComponent<MyComponent3>();
        var myInterface1 = myComponent2.GetComponent<IMyInterface1>();
        //do something
    }
}