raw_tex commands substitution with bibtex input

[bapt a <auguieba-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

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Hi,

I'm not sure how to approach this: suppose I want to produce html output 
from a .bib file uses LaTeX commands such as `\textregistered`, or 
`\myname` as an alias, etc. but outside a math environment 
(`$\textregistered$` would be fine, as it's handled as Inline Math and 
passed to mathjax). 

With a different input format, I could use the `+raw_tex` extension to make 
sure pandoc does not drop the latex commands, and have a Lua filter perform 
the desired substitutions, as in this answer: 
https://stackoverflow.com/a/56391373

Unfortunately, I'm getting this message from pandoc: "The extension raw_tex 
is not supported for bibtex"

Is there a workaround for such substitutions? 

Many thanks,

baptiste


---
pandoc test.bib --from bibtex+raw_tex -t csljson -o test.json

sample bibtex

@preamble{"\providecommand{\textregistered}{\unicode{xAE}}"}
@preamble{"\providecommand{\customalias}{Akshay Agrawal}"}

@article{agrawal2021mde,
author = {\customalias and Alnur Ali and Stephen Boyd},
doi = {10.1561/2200000090},
journal = {Foundations and Trends{\textregistered} in Machine Learning},
number = {3},
pages = {211--378},
publisher = {Now Publishers},
title = {Minimum-Distortion Embedding},
url = {https://doi.org/10.1561/2200000090},
volume = {14},
year = {2021},
bdsk-url-1 = {https://doi.org/10.1561/2200000090}}



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