{                                                                                
    "root": {                                  
        1 => {
            "XYZ": [              
                "1234"                 
            ],
            "ABC": [              
                "6.13.00"              
            ]                          
        },                                     
        2 => {
            "BAB": [              
                 "ASDAS",
                 "12312321"
            ],
            "SADA": [              
                 "6.13.00",              
                 "1231231"
            ]                          
        }
    ]
}

##</code><code>##

        push @{ $href->{test} }, {
            group  => $group,
            values => [ sort uniq $value, @{ $href->{values} // [] } ]
        };

##</code><code>##

    my $test_num = 0;
    for my $file ( @test_files ) {
        $test_num++;
        ... 
        for my $line (<FILE>) {
            push @{ $href->{ $test_num }{ $group } }, $value;
        }
    }