It's so basic. In all other apps it exists: Apple music, YouTube, almost each media player, etc. Because it's nessecary. They all have: 1. "add to queue", which means add to the end of the queue (like real queue - FIFO). 2. "Play next", witch means add to the top of the queue.
You want it to be simple, but this is the most clear, logic, understandable and comfortable way to do it.