Wait they took that away? I have an S9 and I rely on this to know whos messaging me. Blue is textra, purple is whatsapp, white is insta, green is signal.
I had an S8 a couple years back and upgraded to an S10 when it first came out. The notification light went away and it was a huge bummer. I now have a Pixel 7 and it doesn't have it either, so I've learned to live without it.
An app called aodNotify brings this back for you if you don't have an iPhone. May take a little tweaking to get everything how you want but it's very customizable
I had an always on display that illuminated the outside of the display when I received a notification but otherwise stayed off, and I’m on iPhone, so I can’t imagine you don’t have more options on android than I did.