While the Nokia 7.1 has a 'depth' camera. It is unclear if the 5MP camera has been exposed to developers (doubtful) or is part of the overall camera system for image enhancement (more likely).
On the other hand a phone like Samsung S10 5G does have a
0.3 MP, TOF 3D, (depth) sensor accessible to Android app developers.
When referring to depth, its not an hi-res image that a user can look at, but a feature that a camera app developer can take advantage of when the hardware supports it.
For Android developers in the Camera2 API there is REQUEST_AVAILABLE_CAPABILITIES_DEPTH_OUTPUT
Which uses DEPTH16 Android Image format.
For the more technically inclined there is a Medium post on Working with the 3D Camera on the Samsung S10 5G where the author goes into how to use the 3D camera data.
A key point from the article is that the resolution of the DOF is much lower than any visible light image.
The ToF Camera
The front-facing ToF sensor on the Samsung S10 5G is a Sony IMX316. It outputs frames in the DEPTH16 image format with a resolution of 240x180. It has a 75° field of view, which roughly matches the S10 5G’s front-facing camera’s field of view of 80°.
As you can see in the article, the author is using the depth of field image data for bokeh or background blur as each pixel is a depth value and a confidence level. The author also has to apply a variety of techniques to the DEPTH16 data as it appear to be quite noisy.
Those so inclined can get the author's source code here: https://github.com/plluke/tof