Sorry for the late reply - you’re welcome!
There’s two ways to go about this. Either you use the built-in citeproc (citation processing) provided by Pandoc by supplying the necessary arguments: --citeproc, --bibliography and --csl (citation style language). This will convert your citekeys into properly formatted citations in plain text, according to the style language you specified.
Or - and this is what I recommend - you can use a filter provided by the maintainer of the Better Bibtex to convert the citekeys into formatted and editable citations in your ODT document.
You’ll find the needed filter here: Markdown/Pandoc :: Better BibTeX for Zotero
If the instructions linked above are insufficient, see my walkthrough here:
or this writeup by @Luhmann: Instructions for Exporting to Word with "live" Zotero Citations