How to pass environment variables exported from pre_session_script to pre_group_script and run_script in vManager?

My vsif goes like this:

session vm_example_sessions { 
 // Default sessions directory
 top_dir : path/to/top_dir;
 output_mode: terminal ;
 // Try to use NC as DRM
 drm: <text>nc</text>;
 // Setup Simulation Env
 pre_session_script : "path/to/vm_tb_setup.sh" ;
}; 

// Define test group and default simulation attributes for the group
group example_tests { 

 // compile once for test group
 pre_group_script : "path/to/vm_compile_script.sh" ;
 // run script to launch simulation 
 run_script : "path/to/vm_run_script.sh" ; 
...
};

My pre_session_script:

#!/bin/sh

# Example of environment variable set
export RESULTS_HOME=$(pwd)
echo "RESULTS_HOME = $RESULTS_HOME"

My pre_group_script:

#!/bin/sh

echo "RESULTS_HOME check: $RESULTS_HOME"
# when executed: 
# RESULTS_HOME check:

My run_script:

Is there a way to pass env variables from pre_session_script to the succeeding group and test scripts? I know I can source all the env variables before launching the VSIF but, I want to make VSIF source all of them instead.