Use custom user fields in trigger

Fabulous! Thanks, Ahmed. I wasn't able to find that placeholders article via web search. It would be really great to have something within the app pointing me to this content when I need it - like here when defining a trigger body:

Or equally heplful, even just adding an example like this to the list:

{{current_user.custom_fields.your_field_key}}

Is it possible to use a placeholder for a custom user field like this? My goal is to have a custom organization field flow to the ticket field when an email comes in.

It's not possible to natively use custom user fields (unlike you can use custom ticket fields). 
However, my way around is using tags. You have to make a separate trigger for each “custom user field” value though which is a bit hectic, depends on how many values you have… but it is doable and it works.

If > ticket tags contain…. then ….

Let me know if that helps