The 1st-gen Zero had the same resonance cavity antenna on-board,[1][2] but it had a nicer design for the external antenna, namely a 0-Ohms(?) resistor that could be desoldered and resoldered at an angle (and be reverted if need be),[3] rather than crudely cutting the trace.

[1] https://i.redd.it/fido28zdv1331.jpg

[2] https://www.embeddedcomputing.com/technology/analog-and-powe...

[3] https://www.briandorey.com/post/raspberry-pi-zero-w-external...