Having said that is it really confusing? The call does not originate from a ground operator, G-XX contact 1 ahead' originates from another aircraft so, surely cannot be misconstrued as meaning 'aircraft ahead of me contact (call) the 1 ahead of you'
But it could also mean (to the unfamiliar, or student / inexperienced)
"I want to contact the one ahead"
"I want the one ahead to contact me"
Sounds ambiguous to me not to use at all! I also say "visual with number 1 / number 2" but only when I can see the other aircraft in the circuit ahead of me ; or "visual with traffic on short / "X" mile final"