如何在Wagtail Admin中添加多对多字段？

from django.db import models

class Tag(models.Model):
    name = models.CharField(max_length=50)

    def __str__(self):
        return self.name

from django.db import models

class Article(models.Model):
    title = models.CharField(max_length=100)
    content = models.TextField()
    tags = models.ManyToManyField(Tag)

    def __str__(self):
        return self.title

from wagtail.contrib.modeladmin.options import ModelAdmin, modeladmin_register
from .models import Article

class ArticleAdmin(ModelAdmin):
    model = Article
    menu_label = 'Articles'
    menu_icon = 'doc-full-inverse'
    list_display = ('title',)

modeladmin_register(ArticleAdmin)

python manage.py makemigrations
python manage.py migrate