Change displayed name of serialisable item in list

KeyValueAttribute.cs

using UnityEngine;

namespace Assets.Game.Utils
{
	public class KeyValueAttribute : PropertyAttribute
	{
		public readonly string PropertyName;

		public KeyValueAttribute(string propertyName)
		{
			PropertyName = propertyName;
		}
	}
}

KeyValuePropertyDrawer.cs

using Assets.Game.Utils;
using UnityEditor;
using UnityEngine;

namespace Assets.Editor
{
	[CustomPropertyDrawer(typeof(KeyValueAttribute))]
	public class KeyValuePropertyDrawer : PropertyDrawer
	{
		public override float GetPropertyHeight(SerializedProperty property,
			GUIContent label)
		{
			return EditorGUI.GetPropertyHeight(property, label, true);
		}

		protected virtual KeyValueAttribute Attribute => (KeyValueAttribute)attribute;

		public override void OnGUI(Rect position,
			SerializedProperty property,
			GUIContent label)
		{
			var fullPathName = property.propertyPath + "." + Attribute.PropertyName;
			var titleNameProp = property.serializedObject.FindProperty(fullPathName);
			var newLabel = GetTitle(titleNameProp);
			if (string.IsNullOrEmpty(newLabel))
				newLabel = label.text;
			EditorGUI.PropertyField(position, property, new GUIContent(newLabel, label.tooltip), true);
		}

		private string GetTitle(SerializedProperty titleNameProp)
		{
			switch (titleNameProp.propertyType)
			{
				case SerializedPropertyType.Generic:
					break;
				case SerializedPropertyType.Integer:
					return titleNameProp.intValue.ToString();
				case SerializedPropertyType.Boolean:
					return titleNameProp.boolValue.ToString();
				case SerializedPropertyType.Float:
					return titleNameProp.floatValue.ToString();
				case SerializedPropertyType.String:
					return titleNameProp.stringValue;
				case SerializedPropertyType.Color:
					return titleNameProp.colorValue.ToString();
				case SerializedPropertyType.ObjectReference:
					return titleNameProp.objectReferenceValue.ToString();
				case SerializedPropertyType.LayerMask:
					break;
				case SerializedPropertyType.Enum:
					return titleNameProp.enumNames[titleNameProp.enumValueIndex];
				case SerializedPropertyType.Vector2:
					return titleNameProp.vector2Value.ToString();
				case SerializedPropertyType.Vector3:
					return titleNameProp.vector3Value.ToString();
				case SerializedPropertyType.Vector4:
					return titleNameProp.vector4Value.ToString();
				case SerializedPropertyType.Rect:
					break;
				case SerializedPropertyType.ArraySize:
					break;
				case SerializedPropertyType.Character:
					break;
				case SerializedPropertyType.AnimationCurve:
					break;
				case SerializedPropertyType.Bounds:
					break;
				case SerializedPropertyType.Gradient:
					break;
				case SerializedPropertyType.Quaternion:
					break;
			}

			return "";
		}
	}
}

SoundData.cs

using Assets.Game.Utils;
using System.Collections.Generic;
using UnityEngine;

namespace Assets.Game.Domain.Models
{
    [System.Serializable]
    public class SoundData : ScriptableObject
    {
        [KeyValue("FileName")]
        public List<SoundItem> Items;
    }

    [System.Serializable]
    public class SoundItem
    {
        public int Id;
        public string FileName;
        public float Volume;
        public bool Music;

        public AudioClip Clip;
    }
}