Anacondas have been found with an entire human inside of them, but alas, their eyes were too big for their stomachs.
A 200lb prey wouldn't normally harm them, but a 200lb prey with a radial clavicle and broad, rigid shoulders is not something nature intended them to swallow.
The majority of them found with such a meal were either dead or dying from not being able to properly swallow them all the way. (Think of getting something stuck deep in your throat) The retrieved bodies had barely begun to be digested.
Could an Anaconda grow or be grown to the right size and be conditioned to swallow and digest something as wide as a Human's shoulders? Probably, but it would take, literally, decades and a lot of funds if you raise it yourself, just for the habitat and larger and larger pigs you'd have to feed it to condition its esophagus and stomach sphincters.
Better to just keep it fantasy. Lot cheaper. But snake vore is THE most realistic vore as far as being swallowed whole goes. The next, and seemingly not covered in this thread, would have to be giant pitcher plants. I don't believe that they exist in nature, but genetics could probably create them. There do exist giant fungi living in the soil. I haven't heard of any bodies being found enveloped in them, but of course, the fungi would probably absorb 100% of the body, so no bones would ever be found.
Although a scuba diver was found swallowed whole by a whale shark, that was probably an accident since they eat plankton. Most other marine vore is HARD vore. Most fish have teeth and they use them on prey too big to swallow in one gulp. Cephalopods have a very sharp beak, so giant squid and octopi are HARD vore as well.