I have the need to display the value of the "PHONE 2" field that appears on Contact Records, in email notifications sent from Web Help Desk in Email Templates:

I am aware of this Help Article that lists out the "Tags" that can be used:
But I'm also aware that the list above isn't completely exhaustive as the "Send E-Mail" Action under Setup>Processes>Action Rules has some attributes that aren't listed in the Help Article above:

For example, on the "Action Rule" it lists <scheduled_datetime> but in the help article, it lists <scheduled_worktime> with similar but different descriptions. While the Help Article lists <ticket_url> but on the action rule that "ticket attribute" isn't even listed, but I know it works if you use it in the "Action Rule".
To that end, I want to know which "Tag" can be used to display "Phone 2" in emails the system sends?
I tried <client_phone_2> thinking that would be the actual field name in the "Client" table, but that didn't work:

Other ideas? @Avadhut.Deshpande do you know how to access the "Phone_2" field in the dbo.Client table using a "Ticket Attribute" as described above?