Show Ice Barrier and amount of damage can be absorbed.
It ONLY works for max level ice barrier and without any other damage-absorbed effect, like Power Word: Shield.
If your Wow language is not English, you need to change "Ice Barrier" in the custom options. For example "寒冰護體"
Many thanks to my mage friends for helping me test this code.
A similar progress bar WA is here. https://wago.io/WuS1PV2Qd