Inserting a new data structure in a bless reference

[Parag Kalra]

The simplest way I thought of expressing this question is through
Pseudo-script so here it is:

use strict;
use warnings;
use FooBar;

my $obj = FooBar->new;
....
....
Do something
....
...
$obj->{'new_key'} = 'some_value'

Now I am not sure if that is the correct way of inserting a new data
structure into an already bless reference

My aim to use this data structure across the script and FooBar through the
object -$obj once added.