Related Posts for multiple Custom Post Types

If we want to use related posts with our own custom post types, we can use this function:

function allow_my_post_types($allowed_post_types) {
    $allowed_post_types[] = 'your-post-type';
    return $allowed_post_types;
}
add_filter( 'rest_api_allowed_post_types', 'allow_my_post_types' );

But what if I want to add multiple CPTs? I′ve tried adding them line by line but that didn′t seem to work.

function allow_my_post_types($allowed_post_types) {
    $allowed_post_types[] = 'your-post-type';
    $allowed_post_types[] = 'another-post-type';
    $allowed_post_types[] = 'a-third-post-type';
    return $allowed_post_types;
}
add_filter( 'rest_api_allowed_post_types', 'allow_my_post_types' );

Not sure if that′s the right approach or if I can pass all post types as an array or something.

Thanks!

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