请问tag_per_page syntax语法格式是什么？

[majunze2001]

# _config.butterfly.yml
_
# The banner image of tag page
# format:
#  - tag name: xxxxx
tag_per_img:
  - 'A': '/images/img3.webp' # not working
  - A: '/images/img3.webp' # not working
  # ???

# page-1.md
---
title: page
date: 2023-08-10 18:36:59
tags: "A"
---

This is another page

[jerryc127]

https://butterfly.js.org/posts/4aa8abbe/#%E9%A0%82%E9%83%A8%E5%9C%96

tag_per_img：
  aplayer: https://xxxxxx.png
  android: ddddddd.png
  
category_per_img：
  隨想: hdhdh.png
  推薦: ddjdjdjd.png

[majunze2001]

把引号拿掉也没有生效啊