Could you tell me how to use MAC addresses for host name.

[kobayashi.shuttle]

Dear pioneers.

Hello.
I'm trying to monitor the OLT and ONU using function of the host prototype . I want to use the MAC address as a host name to identify the ONU, however I couldn't register it because ':' is a character string that cannot be used. Initially, I tried to replace ':' using function of the preprocessing. As a matter of course, ':' used in the JSON format was also replaced, and resulting in a syntax error. It is enough for me to get remove the ':'.
sample Before"00-AB-CD-12-34-56" After "00ABCD123456".

The following the Zabbix Configuration.
ZABBIX version : 6.0 LTS
OS: Debian 11 (bullseye)
Zabbix Component : Server Frontend,Agent
DATABASE PostgreSQL 13
Other : PHP and Apache
Monitoring object : OLT made by MIHARU(GE-PON), and ONU

Thanks for reading.

[cyber]

00-AB-CD-12-34-56 seems to be completely usable hostname... So what's the problem...? Where is that ":" you keep telling about?
Maybe giving an example json would be best?