potresti provare con un alias in stile linux.
e nella documentazione ufficiale ne fa qualche riferimento:
Update your path
You can update your PATH variable for the current session only at the command line, as shown in Get the Flutter SDK. You’ll probably want to update this variable permanently, so you can run flutter commands in any terminal session.
The steps for modifying this variable permanently for all terminal sessions are machine-specific. Typically you add a line to a file that is executed whenever you open a new window. For example:
Determine the directory where you placed the Flutter SDK. You will need this in Step 3.
Open (or create) $HOME/.bash_profile. The file path and filename might be different on your machine.
Add the following line and change [PATH_TO_FLUTTER_GIT_DIRECTORY] to be the path where you cloned Flutter’s git repo:
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export PATH="$PATH:[PATH_TO_FLUTTER_GIT_DIRECTORY]/flutter/bin"
Run source $HOME/.bash_profile to refresh the current window.
Verify that the flutter/bin directory is now in your PATH by running: