Place it right after the visual punchline in reaction edits, then follow with Nelson's Ha-Ha! for a bigger group reaction or swap in the Laughing Dog Meme when the subject is an animal. Keep it as the first reaction hit before any closing sting.
このサウンドについて
This is a short human laugh lasting just over a second, a single burst of giggling with no words or music behind it. Hearing it feels playful and a little teasing, like someone reacting before they can explain the joke, which makes the moment land as light and silly rather than serious.