Configure Macrium to automatically an encrypted drive

I have an encrypted data partition which is part of a scheduled backup plan which of course works fine if the back runs while the PC is awake and I've unlocked the encrypted drive

Previously to the PC being rebuilt Macrium woke the PC if necessary to complete a backup and all was well

Therefore, I assume that Macrium was somehow configured with the Bitlocker password to automatically unlock the encrypted partition

I found an old printout of the command "$SecureString = ConvertTo-SecureString "<password>" -AsPlainText -Force; Unlock-BitLocker -MountPoint "<drive letter>:" -Password $SecureString" but obviously with the relevant password and drive letter substituted

Anyone know how I configure Macrium with the above command to automatically unlock the drive in the event that the PC is woken up for the backup task?