gvimrc isfname

I have a file in Skill script with following line

load("/user/getShellEnvVar("$USER")/filename")

How do I change isfname to descend into the correct file (path below) when I press gf in gvim
Correct file path is: /user/$USER/filename
where $USER is the username environment variable.

I have multiple such paths with getShellEnvVar() function in Skill which is used so as to evaluate the environment variable in shell directly from Skill.

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