Can you take some screenshots? 

I haven't managed to find this feature in Oreo based ROMs, it can't be that Google removed it in later versions.. 

Maybe it's your phone's specific software?

My near stock Android 6 can do this already. It allows me to set specific limits, it shows the name of each device connected, and allows me to block specific devices 

I want to switch my Redmi 4X to a custom stock android based ROM, but I often use the hotspot feature in MIUI and the ability to set limits and kick/ban people off your hotspot really comes in handy, and I would really like to preserve this functionality when switching to a new ROM. Is there an app or a ROM based on Stock that can do this?

Is there a custom ROM available with hotspot management as good as MIUI's?