You cant but the /boot as raid
However the / or root part can be placed as raid, I did this and I will show you how to do this, but please don't do it.
Here where it gets bad.
You wish to update the system and kernel and all this can affect the RAID/ now the config for the raid is done in the kernel and stored in boot part, so you always updating this and your always keeping the disks busy, even on network packet level. Everything happens will happen on the /
What you want to do is look into purchasing a small reliable drive
Like 64 GB or 128 GB NVMe SSD and using that as your /
or If that is too fancy or expensive, get USB thumb drive and pair it with samsung SD card and install the root part
Then create RAID 10 on the 4 other drives, cause even if the /root fails it wont matter . pop another one and it will auto detect the raid , with cockpit it is very easy to detect the RAID and activate it and mount it