Place it as the immediate reaction after the reveal in your edit, before any commentary continues. Follow it with a yaaaay cheer for a bigger group celebration, or precede it with a baby laughing meme when the good news is about a kid.
關於此聲音
This is a very short voice clip of a person saying the Portuguese line 'Coisa boa hein Cleide' in an upbeat, teasing tone. It lasts just over a second and lands as instant approval, like cheering a lucky break or a tasty surprise. The feeling is light, amused and approving, perfect for reacting when something turns out better than expected.