I use Formidable Form plugin.

I would like to recover author last name and author first name on current single page with $post. I would like to add these datas in Formidable Form.

Formidable Form can only get datas from $post.

I can use a shortcode post_meta with Formidable to get post datas I need.

[post_meta key=whatever]

Example :

[post_meta key=post_author]

For the moment with $post I only got :

[post_author] => 55

How can I add new datas in $post please ? I would like to add author last_name and fist_name in $post array(). Because the author ID cannot be used with Formidable