Can PML be achieved?

In time-domain wave problems, PML (Perfect Match Layer) serves as an excellent artificial boundary, capable of addressing the pseudo-reflection phenomenon caused by truncation boundaries. Is it possible to implement this artificial boundary in FreeFEM? Actually, I noticed that several friends have mentioned PML here, but it seems that no one can solve the related problems.

The problem with the PML method is your a lot of case,.

They is no problem to do PML with freefem++, and some exemple use PML.

Thank you for your response. Where can I find such a case?

find PML in examples.

you can see FreeFem-sources/examples/ffddm/Helmholtz_geophysics.edp at develop · FreeFem/FreeFem-sources · GitHub

Thank you very much!