It should actually be possible. The board can support RAID level
0/1/5/10 (Z690)
Have you tried setting it up with this
https://www.microsoft.com/store...
first install the Intel Driver Update Wizard to make sure the drivers are up to date.
https://www.intel.de/content...
However, it would certainly make more sense to install all the hard drives beforehand and to add the correct drivers to your Windows installation boot stick so that your raid system is already recognised during installation. However, there are different driver versions which depend on the processor generation.
Intel® Rapid Storage Technology driver installation software with Intel® Optane™ memory
https://www.intel.de/content...