I used this tray to make cubes and the Hakka version of what you posted. My son loved them at 2.5 months and it was really helpful for when he was sick and didn’t want to eat as much.

I had to hold it for him until he was probably 5 months, but he would chew on it and then drink the liquid so it was still a bit messy but not bad. Now he’s much messier when I put fruit in it lol