Additional Functionality in Theme, if possible?

Hi,
I’ll try to explain in short:
– My site is https://www.orangefreesounds.com/
In all posts (except 3 scrolling on main page) I used core WP player for mp3 reproduction.
What I need: ability to play sound that is “inside the post” from main page, without “entering the post”- something like “sound preview” – this means “1 click less”.
-Examples:
1- https://freesound.org/ – play button on post preview (inside the post is separate player)
2- https://www.audioblocks.com/ – even better – play & sound preview “On Mouse Over”
Both sites are not in WordPress, as much as I can see.

Not looking for “ready-made” solution (such as plugin – not bad if somebody knows some :), just to point me in right direction. Do I need additional CSS class, some work in PhP, Java Script, jQuery?
Any help mostly appreciated – I’ll share the results here, if I succeed.
Thanks in advance for any suggestions.