Do I need to decrypt my data drives, D:\ or E:\ before re-installation Windows?

[KP001]

Hi, Now I am running Windows 10 Pro with BitLocker enabled on C:\, D:\ and E:\. D:\ and E:\ are my data drives and want to keep the data can access after re-installation. As I know I can either decrypt or no need decrypt System drive, C:\ because the encryption key will be erased when I delete the system partition in the re-installation step. But I'm not sure I must decrypt the data drives, D:\ and E:\ before re-installation the Windows or not?

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