The actual lens? How did you manage to break that?
DJI only sell the UV filter that originally comes with the P3, I think you will need to buy a whole replacement camera or a 2nd hand damaged one that you can try and swap the parts.
I'd say it's been lost in translation. I'd say it's the screw on uv filter that you might think is called the lens.
Is it the very front piece of glass?