Subscript in title entries

Hey,
just a general thing where I would like to hear/read some thoughts of others.

I often deal with publications with subscripts, i.e. chemical formulas like Al2O3. I write most things in LaTeX so I export my library as Bibtex/Biblatex.
To correctly display the title of such a paper I have to use "Al2O3"
in Zotero. Which is tranlasted to
"Al$_{\textrm{2}}$O$_{\textrm{3}}$"
in the bibtex-file. This, however, is not realy readable or searchable within Zotero.

When I don't use this (so just plain "Al2O3"), it obviously will be printed that way as reference in my PDF.

Have you ever stumbled upon something like that? How do you guys handle this?
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