I'm sure there is a PTS for it.

But the problem is that any airplane which actually requires an FE is going to be extremely expensive to operate. Even simulator time could cost thousands per hour.

For those few jobs which still require an FE, they usually just want you to show up with the written test complete. The actual training and practical test will be done in the sim after they hire you.

If you want to be a professional FE (a rapidly dying breed) you probably would have to get experience in the military...I don't know of any other way for a newbie to "build FE time".