Hi,
Thank you for posting in Microsoft Q&A forum.
Yes, you can manually install Language package. Or you can also do this via task sequence:
Multilingual Windows 10 20H2 OSD with ConfigMgr
How to Upgrade Windows Clients with Multiple Languages installed to Windows 10
Windows 10 Multilanguage Deployment with MEMCM
Thanks for your time. Have a nice day!
Best regards,
Simon
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