Can you post the perl script and source data files that you used to create the report shown on you original post ? i.e.

{                                                      
    "name": "test1",  
    "all_data": [                                         
        {                                              
            "sub_data": [                                  
                {                                      
                    "sub_name": "Test1",               
                    "sub_path": "GROUP1/Test1",        
                    "info": [          
                        {                              
                            "group": "pkgs",            
                            "values": [              
                                "tcsh"                 
                            ]                          
                        },                             
                        {                              
                            "group": "tcsh",            
                            "values": [              
                                "6.13.00"              
                            ]                          
                        }                              
                    ]                                  
                },                                     
                {                                      
                    "sub_name": "GROUP2",              
                    "sub_path": "GROUP2",              
                    "info": [          
                        {                              
                            "group": "pkgs",            
                            "values": [              
                                "tcsh"                 
                            ]                          
                        },                             
                        {                              
                            "group": "tcsh",            
                            "values": [              
                                "6.13.00"              
                            ]                          
                        }                              
                    ]                                  
                },                
            ],                                         
            "all_data_name": "ROOT",                       
            "all_data_path": "/PATH/TO/ROOT"
        }
    ],
    "username": "erwerwcsd",
    "timestamp": "1564475903"
}
[download]

It looks like something like this (removed the checks):

my $number_of_mains = 0;
my $number_of_subs = 0;

foreach my $main (sort(uniq(@mains_paths))) {
    my (@list_of_dirs,@subs_data);
    my $main_path = abs_path($main);

    find( sub { get_valid_dirs( \@list_of_dirs, $_ ) }, $main_path);

    my $main_name = basename($main_path);
    my %main_block = (
        $ALL_DATA_NAME => $main_name,
        $ALL_DATA_PATH => $main_path
    );

    $number_of_mains++;
    
    foreach my $dir (sort(@list_of_dirs)) {
        my ($sub_path,$sub_name,$relative_sub_path,$paths_all,$results
+_all,@results_data,%sub_block);

        $sub_path = dirname($dir);
        $sub_name = basename($sub_path);
        $relative_sub_path = File::Spec->abs2rel($sub_path,$main_path)
+;
        %sub_block = (
            $SUB_NAME => $sub_name,
            $SUB_PATH => $relative_sub_path,
        );

        $results_all = $dir."/".$DIR_NAME."/".$RESULTS_FILE_NAME;
        unless((-e $results_all) && (-s $results_all)) {
            next;
        }
        prase_file($results_all,\@results_data);

        $number_of_subs++;

        @{$sub_block{$RESULTS}} = @results_data;
        push(@subs_data,\%sub_block);
    }
    @{$main_block{$SUBS}} = @subs_data;
    push(@mains_data,\%main_block);
}

@{$all_mains{$MAIN}} = @mains_data;
$all_mains{$REPORT_NAME} = $opt_href->{$REPORT_NAME};
$all_mains{$MAIN_COUNTER} = $number_of_mains + 0;
$all_mains{$SUBS_COUNTER} = $number_of_subs + 0;
$all_mains{$TIMESTAMP} = $start_time + 0;
[download]

I'm trying now to understand how to do the opposite thing.