Just see the parameters column in Joomla extension table:
#__extensions
You can filter the open graph extensions with:
SELECT extension_id, name, type, element, params FROM `jos_extensions` WHERE name = 'plg_content_phocaopengraph' OR name = 'plg_system_phocaopengraph';
{"title":"","title_type":"1","type":"article","image":"","url":"","site_name":"","description":"This is some description","titlef":"","title_type_featured":"3","desc_type_featured":"3","typef":"article","imagef":"","urlf":"","site_namef":"","descriptionf":"","displayf":"1","titlec":"","title_type_category":"1","desc_type_category":"1","typec":"article","imagec":"","urlc":"","site_namec":"","descriptionc":"","displayc":"1","app_id":"","other":"",
"render_type":"2","display_itemprop_image":"1","desc_intro":"0","remove_strings_description":"","disable_menu_items":"","disable_views":"","disable_options":"","parameter_image":"1","change_svg_to_png":"0","twitter_enable":"0","twitter_card":"summary_large_image","twitter_site":"","twitter_creator":"","article_display_category_image":"0","test_article_layout_param":"0"}
render_type: 1 ... name
render_type: 2 ... property
Jan