Yes, Nokia 7 Plus does have the hybrid sim slot. You can use either 2 sim cards or 1 sim card & 1 memory card.
Yes, Nokia 7 Plus in-the-box accessories include a pair of an earphone as well.
Nokia 7 Plus front camera is 16MP and it has an aperture of f/2.0.
No. Nokia 7 Plus does not have the notification light. But it does have the ambient display, so you will always get alert on the display.
Great battery life, immersive display, solid design, and software at its purest, that's the Nokia 7 Plus for you.