Comment 4 for bug 1925019

verification-done-focal:

# ubuntu-drivers list-oem
oem-stella.cmit-rattata-meta

# apt-cache policy oem-stella.cmit-rattata-meta
oem-stella.cmit-rattata-meta:
  Installed: (none)
  Candidate: 20.04~ubuntu1
  Version table:
     20.04~ubuntu1 500
        500 http://tw.archive.ubuntu.com/ubuntu focal-proposed/universe amd64 Packages
        500 http://tw.archive.ubuntu.com/ubuntu focal-proposed/universe i386 Packages

# sudo apt-get install oem-stella.cmit-rattata-meta
https://paste.ubuntu.com/p/MxK8R9zxMB/

And the update-manager shows the meta package as well:
https://i.imgur.com/lXlsjSy.png