Changing compose Tables to add new entries?

My PC is running EndeavourOS Linux with KDE Plasma as the DE. I have recently discovered the concept of a compose key while skimming through the colemak website . In the section where it's being introduced the author mentions: > You can edit the tables and add pretty much anything though! While after a bit of searching through the system settings, I have been able to set a key as my compose key, I have yet to find this fabled compose table where I can add anything I'd like for the compose key to translate and web searches have yielded no results so far. I'd appreciate if anybody could point me to where this file is located, thank you.