I actually do everything Locally, do not like having to work online but costs a little  more, needs a little more space, uses up quiet some time setting up the programming for own benefits. So I would rather think not something to be Integrated into poser it self it would not be possible for the crew giving support for such engines, Linking these or making bridges is the best solution. But this can't be made with just a plugin as some would like it some others would prefer something else for there needs ...

This might be something for 3D artists helping to improve there works if they want it to look realistic. Not really my style so I'd rather skip that one but I believe that allot might find it a interesting tool for there works without affecting there creativity  .....

The Most INSANE AI Image Upscaler

so actually https://magnific.ai would sure do a good job for these realistic results on your final renders I guess it would be more for the professional needs and still it remains your render your work as you just make a enhancement or an enlargement of  your art.