What data are you looking to put in the tags?
I’m just trying to understand if it’s data that WordPress may already make available.
This seems to be the right way to get to data in the WordPress database:
https://codex.wordpress.org/Class_Reference/wpdb
Once you have the data, you can use wp_head to get the values in the HEAD section. Check out: https://codex.wordpress.org/Plugin_API/Action_Reference/wp_head
For the TITLE, you may need to edit the templates.