Listening to events from the new input system with ECS

[tepid heath]

I am trying to use the input system within ECS systems but I hit a wall trying to handle performed events by actions. This is what I have so far:

public partial struct PlayerCombatSystem : ISystem, ISystemStartStop
{
    public void OnCreate(ref SystemState state)
    {
        state.RequireForUpdate<InputManaged>();
    }

    public void OnStartRunning(ref SystemState state)
    {
        var input = SystemAPI.ManagedAPI.GetSingleton<InputManaged>().Value;
        input.Gameplay.Attack.performed += Attack_performed;
    }

    private void Attack_performed(InputAction.CallbackContext obj)
    {
        Debug.Log("attack");
    }

    [BurstCompile]
    public void OnStopRunning(ref SystemState state)
    {
    }

    [BurstCompile]
    public void OnUpdate(ref SystemState state)
    {
    }
}

Since the Attack_performed function is called without a SystemState ref I can't really do a lot of stuff there, which makes the system kinda pointless. Is there a way that I can listen to events from the input system from the system Update method?

I feel like I am missing something from the input system that would allow me to do this, like reading a boolean that would be true during only one frame kinda like the old Input.GetKeyDown

oh I can just do input.Gameplay.Attack.WasPerformedThisFrame()