Regarding this topic I came across the subject of Open-endedness [1] and the fascinating works of Jeff Clune, Ken Stanley and their colleagues (the two former are currently working at OpenAI).

EDIT: I added this paper [2] by Jeff Clune, a nice introduction of Open-endedness and their potential for reaching general AI.

[1] https://www.oreilly.com/radar/open-endedness-the-last-grand-...

[2] https://arxiv.org/abs/1905.10985