Here is the Answer that I got from Airbus:
ANSWER:
As you correctly stated, in some specific failures (such as Triple ADR failure, double hydraulic failures
G+B,...), this leads to the 'Alternate law, without protection'.
We agree there is no direct mean to inform flight crew that the reduced protection (low-speed stability and
high-speed stability) are lost in case of Alternated law.
Airbus considered there was not necessary to provide this level of information to flight crew.
When the aircraft go to alternate law, in any case, flight crew has to follow the ECAM action provided by
"ALTN (PROT LOST) procedure".