announce for casts in progress on the player

[launchcodemexico]

i want to write an addon that performs the following:

if ([Ability1, Ability2,... AbilityX] is being cast upon you from any NPC's or players) -> announce

for example, if a warlock somewhere/anywhere has targeted you and has begun to cast Chaos Bolt, and it's an ability you've selected to parse, an announcement will be made on screen.

does the API allow for such calls?