Я бы определил базовый ScriptableObject для способности:

public abstract class Ability : ScriptableObject
{
    public abstract void Activate(PlayerController playerController);
    public abstract void Deactivate(PlayerController playerController);
}

И затем создавал бы конкретные типы способностей:

[CreateAssetMenu(fileName = "Double Jump", menuName = "Abilities/Double Jump")]
public class DoubleJump : Ability
{
    public override void Activate(PlayerController playerController)
    {
        playerController.MaxJumpCount = 2;
    }

    public override void Deactivate(PlayerController playerController)
    {
        playerController.MaxJumpCount = 1;
    }
}

Тогда AbilityPickup выглядел бы примерно так:

[RequireComponent(typeof(PlayerController))]
public class AbilityPickup : MonoBehaviour
{
    private PlayerController playerController;
    private List<Ability> activeAbilities = new List<Ability>();
    
    private void Awake()
    {
        playerController = GetComponent<PlayerController>();
    }

    private void OnTriggerEnter(Collider collider)
    {
        if (collider.TryGetComponent(out AbilityContainer abilityContainer))
            AddAbility(abilityContainer.Ability);
    }

    public void AddAbility(Ability ability)
    {
        ability.Activate(playerController);
        activeAbilities.Add(ability);
    }
}

Где то в мире будет лежать объект с компонентом:

public class AbilityContainer : MonoBehaviour
{
    [SerializeField] private Ability ability;
    public Ability Ability => ability;
}