Jenkins扩展电子邮件不会打印$GIT_BRANCH或$GIT_COMMIT。

In the Jenkins "Extended E-mail Notification" plugin, I have created a table about the Build and Git reversion numbers, getting the values through the environment variables that Jenkins sets. All of the table entries are fine apart from the $GIT_COMMIT & $GIT_BRANCH parts. It outputs the strings "$GIT_COMMIT" & "$GIT_BRANCH" respectively. I tried using {} around the environment variable name, with no effect on the output.In the Jenkins "Extended E-mail Notification" p