How To Find a VisualElement

using System.Collections.Generic;
using SoyWar.UIToolkit;
using SoyWar.UIToolkit.Elements;
using UnityEngine;
using UnityEngine.UIElements;

public class MyComponent : MonoBehaviour
{
    // Use UIDocument
    [SerializeField] private UIDocument _element;
    
    // Or UI Toolkit Component
    [SerializeField] private VisualElementComponent _element;
    
    // Or any UI Element
    private VisualElement _element;
    
    public void Method(int index)
    {
        // Create a Selector via the Selector Builder
        Selector selector = Selector.Builder(className: "element").Build();
        
        // Or via the Selector Parser
        Selector selector = Selector.Parse(".element");

        // Get the first VisualElement
        VisualElement visualElement = selector.GetFirst(_element);

        // Get the last VisualElement
        VisualElement visualElement = selector.GetLast(_element);

        // Get All VisualElement
        List<VisualElement> visualElement = selector.Find(_element);

        // Get a VisualElement at the specified index
        VisualElement visualElement = selector.AtIndex(_element, index);

        // Get a VisualElement at the specified index (counting from the end)
        VisualElement visualElement = selector.AtLastIndex(_element, index);
    }
}