Camera long exposure time

I’m implementing android camera and I want to set long exposure time.

I’m using Camera2 API CaptureReqeust exposure time.
But Galaxy series doesn’t seems to support for long exposure time even over a second.
I got exposure time range from using camera2 api and, it was very short.

However, native camera app of Galaxy s20 can adjust until 30 seconds.

I want to implement the exposure time same as the app.

Could you give me the guide or hint?

You can always request a value beyond the defined capability. It will works. But, the consistency is guaranteed in this case.