Use enum values as labels on arrays use [LabelledEnumArray(typeof( ??? ))]

LabelledEnumArrayAttribute.cs

using System;
using UnityEngine;

/// <summary>
///     Use enum values as labels on an array
/// </summary>
/// <remarks>Should not be placed in an Editor folder</remarks>
public class LabelledEnumArrayAttribute : PropertyAttribute
{
    public readonly Type EnumType;
        
    public LabelledEnumArrayAttribute(Type enumType)
    {
        EnumType = enumType;
    }
}

using System;
using UnityEditor;
using UnityEngine;

/// <summary>
///     Property drawer for LabelledEnumArrayAttribute
/// </summary>
/// <remarks>Must be placed in an Editor folder</remarks>
[CustomPropertyDrawer(typeof(LabelledEnumArrayAttribute))]
public class LabelledEnumArrayDrawer : PropertyDrawer
{
    public override void OnGUI(Rect position, SerializedProperty property, GUIContent label)
    {
        // Get property index and enum type
        var index = GetPropertyIndex(property.propertyPath);
        var type = ((LabelledEnumArrayAttribute) attribute).EnumType;

        // Get name, update label if one is found
        var name = Enum.GetName(type, index);
        if (!string.IsNullOrEmpty(name)) 
            label = new GUIContent(name);
        
        // Draw property
        EditorGUI.PropertyField(position, property, label);
    }

    /// <summary>
    ///     Reads the index from the property path string
    /// </summary>
    private static int GetPropertyIndex(string path)
    {
        var start = path.LastIndexOf('[') + 1;
        var end = path.LastIndexOf(']');
        return int.Parse(path.Substring(start, end - start));
    }
}