Hello and welcome. Root on Softraid was not possible until just a couple of months ago for 5.0-current. It is not possible with 4.9 or 5.0-release.
I believe you are confusing RAIDframe and Softraid, which are entirely different technologies. Root-on-RAID has been available with RAIDframe for years.
If you want to convert from RAIDframe to Softraid, you will need to either use -current or wait for 5.1-release.
If you want to upgrade from 4.9 to 5.0 with RAIDframe, you will need to build a 5.0-release RAIDframe kernel on a separate build machine of the same architecture, then follow the 4.9 -> 5.0 upgrade guide, following the steps for upgrading without using the install kernel (bsd.rd).
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