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The jpg format is 8-bit only - the whole point of jpg is to produce small files. (16-bit files are twice the size of 8-bit files)
If you want more than 8-bit, you have to export as 16-bit Tiff or PSD.
But you would only need to do that if the image is going to be edited after exporting - otherwise 8-bit is fine.
You can't tell the difference between an 8-bit and a 16-bit image on screen - the advantage with 16-bit is that it can withstand heavy editing without deteriorating - it gives you editing headroom.
Thank you Per Berntsen!
So, my export options for more than 8 bits per channel is PSD or TIFF...
is there any way that i can do (ex. with plugins) to add more image formats such like PNG or any other image format that supports 12 or more bits per channel?
Lightroom only supports the formats listed when you output. There are no plugins to change this.