1. You need the latest Plasma build from Norbert's repos (see first post in this topic; just replace plasma522 with plasma524, and apps2108 with apps2112)
2. Install
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sudo apt install fprintd libfpam-fprintd
Add your fingeprints.
You may have to reboot if the button is not present.
4. Open /etc/pam.d/sddm and add to the top:
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auth [success=1 new_authtok_reqd=1 default=ignore] pam_unix.so try_first_pass likeauth nullok
auth sufficient pam_fprintd.so
Works on my Thinkpad T490S