Keywords added to Template documents

I created some extra tables in OpenEMR version 5.0.1, and I need some of the fields included in the keywords for the Document Templates. There is a file named download_template.php that handles the replacements in the templates. For instance, {DOB} is replaced by the actual date of birth of the selected patient.
If anyone can help me please let me know. Give some indication of price.
Thanks!

Hi Sergio ,
I would be happy to help as this is well within my area of expertise.
Feel free to reach out to me on andrewjohnson56782@gmail.com
Best Wishes,
Andrew