How to show complex types properties in a Custom Editor

So I'm making some scriptable objects for attacks that go like this:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 
 [CreateAssetMenu(fileName = "New attack", menuName = "Attack")]
 public class AttackData : ScriptableObject
 {
     public enum KnockbackType
     {
         outwards,
         inwards,
         customDir
     }
 
     public string attackName;
 
     [Tooltip("Leave at 0 if no charging.")]
     public AttackPhase chargingPhase;
     public AttackPhase startupPhase;
     public AttackPhase activePhase;
     public AttackPhase recoveryPhase;
 
     [Tooltip("Percentage of time of the last phase (or recovery phase) that we can skip by using an attack different from this one. 0% means we can't skip it at all," +
         " 100% means we can fully skip it.")]
     [Range(0, 100)]
     public float comboDifferentAttackPercent = 50;
     [Tooltip("Time the attacks leaves the target stunned.")]
     public float stunTime;
     [Tooltip("Limited by maxMoveSpeed.")]
     public float knockbackSpeed;
     [Tooltip("Outwards is the basic one.")]
     public KnockbackType knockbackType = KnockbackType.outwards;
     [Tooltip("Leave at 0 if knockbackType is not customDir.")]
     public Vector3 knockbackDirection = Vector3.zero;
 }

The AttackPhase type is a struct that I created like this:

 [System.Serializable]
 public struct AttackPhase
 {
     public float duration;
     public bool restrictRotation;
     public float rotationSpeed;
     public GameObject hitboxPrefab;
 
     public AttackPhase(float _duration, bool _restrictRotation, float _rotationSpeed, GameObject _hitboxPrefab)
     {
         duration = _duration;
         restrictRotation = _restrictRotation;
         rotationSpeed = _rotationSpeed;
         hitboxPrefab = _hitboxPrefab;
     }
 }

Then I created a custom editor for AttackData like this:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEditor;
 
 [CustomEditor(typeof(AttackData))]
 [CanEditMultipleObjects]
 public class AttackDataEditor : Editor
 {
     SerializedProperty attackName;
     SerializedProperty chargingPhase;
     SerializedProperty startupPhase;
     SerializedProperty activePhase;
     SerializedProperty recoveryPhase;
 
     SerializedProperty comboDifferentAttackPercent;
 
     SerializedProperty stunTime;
     SerializedProperty knockbackSpeed;
     SerializedProperty knockbackType;
     SerializedProperty knockbackDirection;
 
 
     AttackData myScript = null;
     bool chargingToggle = false;
 
     private void OnEnable()
     {
         myScript = (AttackData)target;
         attackName = serializedObject.FindProperty("attackName");
 
         chargingPhase = serializedObject.FindProperty("chargingPhase");
         startupPhase = serializedObject.FindProperty("startupPhase");
         activePhase = serializedObject.FindProperty("activePhase");
         recoveryPhase = serializedObject.FindProperty("recoveryPhase");
 
         comboDifferentAttackPercent = serializedObject.FindProperty("comboDifferentAttackPercent");
 
         stunTime = serializedObject.FindProperty("stunTime");
         knockbackSpeed = serializedObject.FindProperty("knockbackSpeed");
         knockbackType = serializedObject.FindProperty("knockbackType");
         knockbackDirection = serializedObject.FindProperty("knockbackDirection");
 
     }
     public override void OnInspectorGUI()
     {
         serializedObject.Update();
         EditorGUILayout.PropertyField(attackName);
 
         GUILayout.BeginHorizontal();
         GUILayout.Label("Has Charging phase", GUILayout.Width(120));
         chargingToggle = EditorGUILayout.Toggle(chargingToggle);
         GUILayout.EndHorizontal();
         if (chargingToggle)
         {
             EditorGUILayout.PropertyField(chargingPhase);
         }
 
         EditorGUILayout.PropertyField(startupPhase);
         EditorGUILayout.PropertyField(activePhase);
         EditorGUILayout.PropertyField(recoveryPhase);
 
         EditorGUILayout.PropertyField(comboDifferentAttackPercent);
 
         EditorGUILayout.PropertyField(stunTime);
         EditorGUILayout.PropertyField(knockbackSpeed);
         EditorGUILayout.PropertyField(knockbackType);
         EditorGUILayout.PropertyField(knockbackDirection);
 
         serializedObject.ApplyModifiedProperties();
     }
 }

This makes the inspector look like this:

So my questions are:

1 - How do I show the properties of my AttackPhase type variables? they do not show when I click on it even with the [System.serializable] property.

2 - Is there any way to change only 1 variable with the custom editor? I only want to change the chargingPhase so that it only shows it's properties once the toggle is set to true, instead I find myself writing dozens of apparently useless lines of code.