Confirmation

• I have read the documentation.
• I have read the FAQ.

Description

Try to use placeholders on "MATERIAL".
But:
The icon "17" in the menu "menu/tpa.yml" has an invalid attribute "MATERIAL"

I need to make a tpa gui,and I want it don't show Offline player
My idea is %changeoutput_equals_%playerlist_online,normal,yes,17%_Offline_air_player_head%
That means if "%playerlist_online,normal,yes,17%" output is "Offline",then set MATERIAL to "air",if not set MATERIAL to "player_head"
I already know how to convert the output
But MATERIAL can't use placeholders,so please

Chest Commands version

ChestCommands version 4.0.3

Additional information

My idea tpa.yml:

17:
  MATERIAL: %changeoutput_equals_%playerlist_online,normal,yes,17%_Offline_air_player_head%
  SKULL-OWNER: '%playerlist_online,normal,yes,17%'
  POSITION-X: 8
  POSITION-Y: 2
  AMOUNT: 1
  NAME: '%playerlist_online,normal,yes,17%'

I provide these in the hope that you can understand my needs.

How did you solve it?