Playing an ambient Continuous Sound as part of a scene.

If you are asking if an ambient sound can be used in a scene? No it can not.

I know what it’s called in your screenshot but there’s hundreds if not thousands of rain songs in their catalogue. You can’t reconfigure the length of time ambient sounds play. If you want it to play longer, do as suggested and make a playlist on repeat. See if you like anything in this playlist: You can use these Apple Music playlists in scenes or automations. Or one track in your own playlist you create.

You probably can find it on Apple Music but you’d have to ask Siri. Or use another device that has Siri, like an iPhone to Shazam it, just ask Siri “what song is this”. If it says I can’t do that, ask again because it can. Siri has built in Shazam. Once you know the title of your favourite rain track, you create a playlist in Apple Music and use that playlist of one track to play on repeat so it loops..

There’s loads of nature sounds with rain on Apple Music you can search for like soft rain, thunder storms, jungle rain, hard rain and so on.