I'm going to assume you just want a way to show your total absorb remaining (and don't really care what ability it is from).
Make a text WeakAura, under Display -> Display Text -> type %c and press accept.
Update Custom Text On... -> Trigger Update
Expand Text Editor under Custom Function and add the following code:
Go to the Trigger page next and do the following:
local absorb = UnitGetTotalAbsorbs("player")
if absorb == 0 then
absorb = ""
Type -> Custom
Event Type -> Event
Custom Trigger expand this and add the following code: