将自定义参数传递给棉花糖模式和预处理方法

Question

我是marshamallow的新用户，尝试使用模式验证Python中灵活的JSON/dict记录。在实例化marshamallow模式时，有没有方法传递自定义参数？另外，如何将自定义参数传递给模式的预加载方法？我的要求如下

    from marshmallow import Schema, fields, post_load, EXCLUDE, validate, \
    validates, pre_load

    class UserSchema(Schema):
      name = fields.Str()
      joined_on = fields.AwareDateTime()

      @pre_load
      def sanitize(self, data, **kwargs):
          tzinfo = kwargs.get('tzinfo')
          data['joined_on'] = tzinfo.localize(data['joined_on'])
          return data

     schema = UserSchema()
     user = schema.load({"name": "Tim", "joined_on": datetime.datetime(2019, 10, 23)}, tzinfo=pytz.utc)