I hate it when you change the API and break addons, but in this case I would make an exception. Could you change the API to allow us to see how much our shields are going to shield for?
I have a weakaura that does a pretty good job, but it doesn’t take into account things like set bonuses. Like the mage healing AQ40 4-set. Or the priest ones. Or the warlock ones. It makes coding a solution incredibly difficult and intricate, when the game already knows the correct answer very simply. And there’s no reason to hide it from us.