Custom pretty printer pass option to buff-imp-<mycustomformat>.lua

[Lorenz <lorenz@fastmail.com>]

I'm customizing a pretty printer and referencing the buff-imp-lua.lua
and buff-imp-lua.mkiv files.  

I'd like to add a conditional to the .lua file say buff-imp-custom.lua. 
What is a good way to pass an option from my .tex file to conditionally
format with the pretty printer?   I'd like to use the same
buff-imp-custom.lua and .mkiv pairs of files instead of creating
multiple files.

The .mkiv file defines e.g.:

    \definetyping
        [CUSTOM1]
        [\c!option=custom]

I'd like to add say CUSTOM2 but pass an option that would be visible to
the same buff-imp-custom.lua file.  Perhaps something like this?:

    \definetyping
        [CUSTOM2]
        [\c!option=custom,<option visible to same lua file as CUSTOM1?>]


Thanks 

--
Lorenz
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