Possible notification of demotion/mmr tracker in-client

I get that demotion is a required risk for playing ranked. This is also all based on what I've heard and I am in no way an expert. If you have 0 lp and if you lose, then you run the risk of demotion. However, I think that it's kind of unfair that we don't really know if we are going to be demoted if we lose or not. For example, say you have 12 LP and then you lose the next game. If your mmr is low enough then you actually will be demoted. What I have a problem with is that, there is no way for us in-client to actually know "oh hey, I've been doing bad recently, I'll probably drop a rank if I keep going, maybe i should stop here". We have to rely on third party sites to get our mmr info and even then at times people can get demoted out of the blue. So it is my personal opinion that we should have demotion notifications or at least an mmr tracker in-client. But that is just my opinion. Also, if a red could come in and possibly just explain why we can't have it or how demotion and all that works, that would be lovely. Again, just my opinion. Q_Q