How to set up Custom issue tracker

Good afternoon. I do not speak English and could not find the question that interests me. I apologize if I wrote not in the forum category.
Can you please tell me if it is possible to set up in Gitlab CE the functionality of creating links to the system of accounting of tasks of its own production, corresponding to the functionality of Example in the picture

When I add the text “fix-123” to the comment, I need that gitlab make this text reference
How can I configure this in Gitlab CE?
Does this support the Custom issue tracker?