Adding a description to theme customizer controls

Question

How could I add a description to $wp_customize->add_control? I've found I really need to include a short description on some of the controls but it doesn't look like it's possible.

I noticed you can add a description to $wp_customize->add_section but that's only a tooltip.

This is ideally what I'd like to do, but unsure on how to output it and if this is possible:

$wp_customize->add_control( 'theme_options[some_option_name]', array(
    'label'   => 'This Is Some Option',
    'section' => 'theme_name_section',
    'type'    => 'text',
    'description' => 'Wish this existed', // this isn't possible
));