I think that part of the complication is the view that “to create” implies a material creation as if like manufacturing.
But things can be created in a number of ways. For example, humanity is created in the image of God. Not merely created in a material sense, but created in a positional sense.
If you have a King (God) and Heaven and Earth are the Kings temple, and the inhabitants of the temple are assigned roles…
You could imagine how the sun and the moon might be created to do something (to rule the day and the night) much like a football player is chosen or created to be a quarterback of a team. And that’s not necessarily a matter of ex nihilo creation. Rather it’s about anointing or appointing, or choosing, or assigning etc.
Heaven and Earth is the Lord’s temple.
Isaiah 66:1-2
1 Thus says the Lord: Heaven is my throne and the earth is my footstool; what is the [temple] that you would build for me, and what is my resting place [consider the 7th day]?
2 All these things my hand has made, and so all these things are mine, says the Lord…