/Export-Image is used for Creating a new .WIM file that includes only the files you need from a single volume image, I don’t see your command includes the parameter which can export language package part. I don’t think we can easily use this /Export-Image command to Split one wim into multiple single language wims.
Microsoft document doesn’t give any example related language package export.
https://learn.microsoft.com/en-us/windows-hardware/manufacture/desktop/dism-image-management-command-line-options-s14#export-image
In my opinion, if we wan to INJECT LANGUAGE PACK WITH DISM, this guide is helpful.
https://systemcenterdudes.com/inject-language-pack-windows-10/
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