Using keyed array in template

My controller has this:

PHP:

$colors = ['30' => 'blue', '55' => 'green'];

$viewParams = [
    'colors' => $colors,
    'entity1' => $entity1,
    'entity2' => $entity2
];

return $this->view('ASP\Foo:bar', 'asp_foo_bar', $viewParams);

And my template has this
HTML:

<xf:comment>
    {$entity1.sys_id} --> this prints 30
    {$entity2.sys_id} --> this prints 55
</xf:comment>

So basically, what I'm trying to achieve is PHP's equivalent of the following inside the template:
PHP:

$bgcolor1 =...

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