Salaam
Actually, we do know what the Alif Laam Meem, and Ha Meem mean in the initialed verses in the Quran. You will find often in the same verses or in the proceeding verse with the Arabic initials, that they are the proofs/signs of the Quran. Thus, they are responsible for proving the Quran is from GOD. And if it is a proof from GOD, it would have to be a miracle. Otherwise, humans would dispute and say a human could replicate whatever it was. But, how can letters be a miraculous proof from GOD of the Quran? Good question. Watch this.
peace