Hi there, I've seen many images like those and from what I can see a lot of them are using photoshop actions. Bellevue and others sell them, but sadly they are not for us Affinity users.
It is possible to get close to them by colour grading and careful use of smoothing and HSL/Curves/Blur etc.
There are other tricks built into the actions too for example Peek Throughs which is basically a large soft brush of the right colour applied to both bottom corners of the image on a new layer then blended in to give a certain hue and atmosphere.
If you get the chance have a look at some of the actions and see what they are made up of, up to now I have not found one with magic in it lol........