MyPropertyDrawer.cs

using UnityEditor;
using UnityEngine;

[CustomPropertyDrawer(typeof(MyPropertyAttribute))]
public class MyPropertyDrawer : PropertyDrawer
{
    public override void OnGUI(
        Rect position, 
        SerializedProperty property, 
        GUIContent label)
    {
        var myPropertyAttribute = 
            attribute as MyPropertyAttribute;
        
        property.stringValue = EditorGUI.TextField(
            position, 
            myPropertyAttribute.Label, 
            property.stringValue);
    }
}