I remember seeing somewhere a graph where someone plotted the "complexity" of life vs. time, I think on a log plot, and found a straight line. The line goes to (log) 0 around 5 billion years before the formation of the solar system. The inference from this admittedly dubious exercise was that life originated somewhere before our Solar system, spread here, and continued to evolve here.

I think it was maybe from this source? https://www.sciencedirect.com/science/article/abs/pii/B97801...