Sorry no.,.. you need to start again
Someone said to me today that it can be done but I am not sure if it is true or not. He said I would have to ghost my hard drive, install my 2 new drives and set up the raid and then ghost the data back onto the drive. He claimed he has done it many times but it is time comsuming. This is a tech person I trust so I may let him have a go at it. As long as my drive is backed up, not much to loose trying.