The movie really doesn't say, or give much to an 'origin' story of the CSA.
About them being 'given their powers', anything is possible, sure....
Historically in the comics (the CSA has been around since the mid-1960s, killed in the mid-1980s, then reincarnated and retconned in the early 2000s and even within the past year or so), They have always been the "Earth-3" near-doppelgangers of the "Earth-1" (Justice League), and "Earth-2" (Justice Society) groups.
But early on, not much was revealed about them save their appearance and powers. The 1960s had Earth-3 as a bonkers 'opposite' Earth: Europe was discovered buy Columbus, The UK successfully won their independence from the USA, to all Earth-3 humans have their hearts on the other side of their chest from Earth-1/2 humans, and the Black House vs the White House, evil always triumphs over good, etc.
Recent writers have given them a bit more attention. Ultraman started out as an astronaut exposed to Kryptonite. Each exposure gave him another superpower. Now he is Kryptonian, but on Earth he feeds on kryptonite to keep his powers going, and the yellow sun siphons these powers from him.
Owlman started having mind control powers, being able to dominate people using willpower. In the 1960s he was not so much the paragon of physical prowess like today's Owl/Batman.
Johnny Quick is pretty much just there. A recent "Earth-2" graphic Novel from the 1990s-2000s had him dependent on some sort of speed serum. Not much more than that.
Superwoman is an Amazon. She has been identified as Earth-3's Lois Lane in some instances.
Power Ring I think, is the most interesting, despite in the movie being no more than an at-best a background character. His ring is not a tool of the Guardians of Oa, or whatever Green Lantern is. His ring was once the made-real soul of the "the mad monk Volthoom". Now, Volthoom is much more demonic in nature, and the wearer doesn't possess the ring, the ring possesses the wearer a la Tolkien's LOTR. It feeds on fear - the wearer's or what's going on around it - it matters not. It slowly rots away the wearer, until the wearer dies by the ring. It causes pain, and the wearer cannot remove it.
Sorry for the nerd-out. 'Mirror Universes' always fascinate me, and the CSA has piqued that fascination since I first saw them in the old Justice League comics I had as a kid...
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