A hole is drilled through the top of the frame as shown. Drill the hole at an angle that matches the angle the brake line wants to be in.
The brake line enters the swingarm through the openings behind the shock.
The brake line is routed in front of the shock and away from the chain. The tie wrap keeps it off the chain, but also positions it so that the shock spring doesn't pinch the line against the frame. This could be done better, of course.