Filter dropdown custtom post by only those created by the logged in user

Hi Markus,
Great plugin! Please can you explain how to filter custom posts to those created by the logged in user.

I am aware of the filter

add_filter(“wpcf7_post_tag_get_posts”, “filter_dropdown_posts”);
function filter_dropdown_posts($post_args)
{
$post_args[‘meta_query’] = array(
array(
‘key’ => ‘my_key’,
‘value’ => ‘my_filter_value’)
);

return $post_args;
}

Please could you add a little more detail of how I could modify this to display posts by logged in user only.

Many thanks