Here is a short and simple speculation on how amino acids currently form in space. The 3 most common amino acids are formed floating in molecular clouds and on the surfaces of meteorites. In fact all the building blocks of life are found in space, including fatty acids and sugars.
It seems probable that these could also have formed on the surface of the earth 4.5 billion years ago. The hard part is figuring out how to get from building blocks to whatever early life-forms might've been like.
Evolution as it is usually presented in the classroom incorporates abiogenesis. There’s some talk about organic molecules forming in deep sea vents or clay substrates or outer space as you say, and something about micelles.
And from there a leap to cells and natural selection, with every confidence that science will fill in that great gap as it has filled in so many others, and the notion that organic molecules must also have been naturally selected until they reached the level of complexity called life.
I don’t think I’ve read an attempt to fill the gap in, plausible or no, although I admit I’ve not read in depth on the subject.
Mrs VS