creating new user with specific conf by default without restart nginx

[unknownbody]

I have a php script wich creates new user by DirectAdmin API and it works correclly.
There is an additional config that all users had to have in their nginx.conf:

location / { try_files $uri $uri/ /index.php?$query_string; }

So I edit the /usr/local/directadmin/data/templates/nginx_server.conf directlly and add that lines in it (I know about custome folder but the issue is same)
after this edition when I create new User with API it cuased nginx restart! but it brokes rest of lines.
My question is: How can I set the above config lines in new user nginx conf (in creation proccess or before) without restarting nginx