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我需要在下面的文本中插入一个新行。
cat命令使grep查找应该插入我想要的内容的行。

- "Experimentation":
    - "Overview": experimentation/index.md
    - "home AB":
          - "Overview": experimentation/home-ab/index.md
          - "Metrics": experimentation/home-ab/metricas/index.md
          - "Adtional Metrics":
                - "User Frequency": experimentation/home-ab/metricas/frequencia.md
                - "MVT": experimentation/home-ab/metricas/mvt.md
                - "INSERT": NEW_LINE_INCREMENT
    - "home MAB":
          - "Overview": experimentation/home-mab/index.md
          - "Criação Standard MAB": experimentation/home-mab/criacao-experimento.md

这个文本是mkdocs.yml的一部分，对于每个管道，我需要增加一个链接。
我使用的命令是：

cat mkdocs.yml | grep -B 1 '"home MAB"' | sed 's/.md/\n                            - "b_metric": experimentation\/globo-ab\/metricas\/b_metric/'

我需要在块- "Adtional Metrics":中增量插入新行并保存文件。
我希望每次运行脚本时都增加换行符，添加B和c_metric

- "Adtional Metrics":
                - "User Frequency": experimentation/home-ab/metricas/frequencia.md
                - "Page View": experimentation/home-ab/metricas/pageviews.md
                - "Session Count": experimentation/home-ab/metricas/session_count.md
                - "Click Followed by Play": experimentation/home-ab/metricas/click_followed_by_play.md
                - "Video Watch": experimentation/home-ab/metricas/videos.md
                - "MVT": experimentation/home-ab/metricas/mvt.md
                - "INSERT": NEW_LINE_INCREMENT
                - "b_metric": text_text_text.md
                - "c_metric": text_text_text.md