We filled our in-ground swimming pool with top soil last fall, and this spring we planted a garden in it! It was the best thing we ever did. No more maintenance or chemicals to deal with.
The garden is like having a GIANT-SIZED raised bed. So far there aren’t any weeds and the plants like having extra heat from the cement borders.
LOL. Now that’s one solution to maintenance. The neighbors filled in their pool, and covered it with a hideous cement slab. Ugh. I like your solution better.