No. Bootloader unlocking requires ADB/fastboot commands from a PC. No dialer code exists for that.
If you need to troubleshoot deeper hardware issues, some TECNO devices use *#*#2486#*#* to enter an advanced Engineering Mode. How to Use Secret Codes on TECNO POP 5 Lite
Secret codes are numeric strings entered in the to access hidden device information, tests, or engineering menus. On TECNO POP 5 Lite (Android 10/11 Go Edition), many standard codes work, but some are manufacturer‑restricted. many standard codes work