darktable-cli export 16bit image

how to export 16bit tiff with darktable-cli? I tried with --bpp 16.

from darktable manual (https://www.darktable.org/usermanual/en/overview_chapter.html#darktable_cli_commandline_parameters):

–bpp

An optional parameter to define the bit depth of the exported image; allowed values depend on the file format. Currently this option is not yet functional. If you need to define the bit depth you need to use the following workaround:

–core --conf plugins/imageio/format//bpp=

where is the name of the selected output format.

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