Writes in the parity array can only happen as fast as the parity disk, so obviously you will get very poor performance from SSDs in the array. And it is unclear whether some SSDs can invalidate parity behind the scenes depending on how their internal housekeeping is implemented. So SSDs in the array are not recommended. And they are mostly pointless if your parity disk is a spinner.
You would have to New Config, unassign them, rebuild parity, then try to get your VMs configured to use them as Unassigned Devices.