The camera on Google's latest Pixel 3 smartphone introduced "Night Sight" capability in the Camera app. Initially it was available on only Pixel 3s but has trickled down to all Pixels with varying capabilities.
But Android is a community of hackers. Almost immediately this new Camera app was cross-ported to several other Android phones.
Of course my current Essential PH-1 was one of the ports.
I've installed a couple of the ports. Here's a comparison of a photo taken with the OEM Essential camera app and a port (AeroZero_P3_GC_6.1.013_ABC_2.apk) of the Night Sight camera:
Why have I installed a couple of the ports?
Well, honestly they're still a little rough around the edges.
For example, the Essential PH-1 lets you set an app to launch on a double-press of the power button. Typically that is set to the camera app. On the first port of the Night Sight camera that I tried would prompt for additional permissions when invoked with the double-press of the power button.
The second port I tried consumed a lot of battery and wouldn't take photos back to back while is was doing HDR+ processing. The delay due to HDR+ processing may be normal but I hadn't run into it before.
Current status is that I have a Night Sight camera app (GoogleCamera_6.1.013.216795316-debug.apk) installed but it is not my default camera.