Craft CMS: How to eager-load images and transforms nested in a Matrix field

eager-load-elements.twig

{# eagerLoadElements() explained here: https://bit.ly/3taeKAV 
   TL;DR: eagerLoadElements() lets you use eager-loading syntax for stuff that’s tied 
   to entry already (i.e. stuff you don’t need to pull in via a query). #}
{% do craft.app.elements.eagerLoadElements(
    className(entry),
    [entry],
    [
        'heroImage',
        ['videoGrid.video:posterImage', {
            withTransforms: ['wide1920', 'wide1280', 'wide768', 'wide640', 'wide384']
        }]
    ]
) %}

{# videoGrid: matrix field
   video: matrix block
   posterImage: asset field in the video block #}