If you need, I have an old m.2 to Sata connector I bought and used for 6 months before upgrading to an HBA. If you pay for shipping, I'll send it to you - Its this one
One of the sata port walls is cracked from where I tried to pull a cable out without pressing down the release, but all the ports work great.
You can buy an M.2 with 5x additional sata ports. If your case can take that many drives. It’s non-raid so perfect for truenas though I haven’t tried it.