https://openwrt.org/docs/guide-user/luci/getting_rid_of_luci_https_certificate_warnings
I followed it to the T, but the "Not secure" thing in Chrome is still there.
opkg update && opkg install openssl-util luci-app-uhttpd - Done
Create /etc/ssl/myconfig.conf
with the following content: Done.
[alt_names]
DNS.1 =192.168.2.1
IP.1 = 192.168.2.1
Done
Step 6, 7, 8, 9, 10 Done. Imported mycert.key to Trusted Root Certification Authorities store in Chrome, and restarted browser. "Not secure' msg still there. Urg. Will redo.