I've found that I can use `+raw_tex` which at least allows me to manually 
process the custom commands:

`pandoc -f latex+raw_tex -F filter.py -t native test.tex`

```
#!/usr/bin/env python
from pandocfilters import Para, Str, toJSONFilter 

def foo(key, value, format, meta):  
    if key == 'RawBlock': 
        return Para([Str(value[1])])

if __name__ == "__main__": 
    toJSONFilter(foo)
```

If there's any other approach to this kind of thing then I'd love to hear 
it!

On Tuesday, 31 August 2021 at 08:39:04 UTC+1 Rory Byrne wrote:

> Hi friends,
>
> I am building a LaTeX package which adds some new annotation commands for 
> semantics, like `\argument{...}` or `\conclusion{...}`. I'm brand new to 
> Pandoc, but I would like to parse a LaTeX file containing these commands 
> into JSON output. 
>
> I was thinking that I could write a Pandoc filter which would process 
> those commands, but that doesn't seem possible.
>
> Is there a way to use Pandoc to process a LaTeX file containing custom 
> commands?
>
> Thanks,
> Rory
>

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