What I did when changing from Windows to Manjaro:
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Backup your games in Steam Client on Windows.
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Restore this backup in Steam Client on Manjaro.
No redownloads of games needed…except for necessary Proton runtimes to get the games running.
I transferred about 300GB of games with this method without any problems.
The Steam folder structure for Windows and Linux is completely different, so using the Windows folder structure in Manjaro won’t work.
Steam games work well with the above method (and of course you can use the Steam client on Manjaro to later change the library location to a pure data drive instead of your home directory)
Anyway, the actual more important question for you is how to properly mount ntfs drives.
However, since we don’t know anything about your PC and your intentions how to use it, any help is just pure guessing at the moment.
Please read [HowTo] Provide System Information