如何让wagtail的TimeInput接受秒数？

from django.forms import TimeInput

class CustomTimeInput(TimeInput):
    input_type = 'time'  # 设置输入类型为时间类型

from django import forms
from wagtail.admin.edit_handlers import FieldPanel

class MyForm(forms.Form):
    time_field = forms.TimeField(widget=CustomTimeInput)

from django.db import models
from wagtail.admin.edit_handlers import FieldPanel
from wagtail.core.models import Page

class MyPage(Page):
    time_field = models.TimeField()

    content_panels = Page.content_panels + [
        FieldPanel('time_field', widget=CustomTimeInput),
    ]