Jira & Git Lab Integration

I am integratin Jira with Git Lab for the first time. In the documentation it says that I need to integrate inside a project -> settings -> integrations.
I have more than 300 projects so I was wondering if I have to to this project by project or there is some way I can integrate the whole platform with Jira at the same time. I saw that there is a Service Template that I can fill with jira Information but the integration only seems to work when I do it with just one project.