How to properly use ${FILE,path=foo.txt} in Jenkins?

[Ilia Basin]

Hi.
I'm trying to use the syntax `${FILE,path=foo.txt}` to  introduced in Token 
Macro Plugin 1.11. My plugin version is 1.12.1
In what context can this be used? My project is a freestyle project. It 
creates foo.txt, then I have the EnvInject step with the following:

    AAA=${FILE,path=foo.txt}

and then the shell step:

    echo "AAA=$AAA"

Here's the console output:

    [basintest] $ /u01/jenkins/jenkins_shell -xe 
/tmp/hudson8306494744167210672.sh
    + . /tmp/hudson8306494744167210672.sh
    ++ cat foo.txt
    aaa
    [EnvInject] - Injecting environment variables from a build step.
    [EnvInject] - Injecting as environment variables the properties content 
    AAA=${FILE,path=foo.txt}
    
    [EnvInject] - Variables injected successfully.
    [basintest] $ /u01/jenkins/jenkins_shell -xe 
/tmp/hudson6182970742482538021.sh
    + . /tmp/hudson6182970742482538021.sh
    ++ echo 'AAA=${FILE,path=foo.txt}'
    AAA=${FILE,path=foo.txt}
    Finished: SUCCESS

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