Add more metrics with graphs - RPE, training load, etc

I would really like to be able to add more personal information about my training. I am using this website to monitor my training and I know that in order to improve, I need to keep track of my k's, but also how hard I felt I worked or how hard a certain workout felt. Similar to the 'health' function, where you can input your weight and see it on a graph, I would really, really like to be able to add in some more metrics such as:

• RPE
  
• Hours of Sleep
  
• Quality of Sleep
  
• Muscle soreness
  
• Overall fatigue
  
• Stress
  
• Overall wellness perception
  
• Resting HR
  

The most basic and important one to add and see graphed would be training load, where training load = RPE * session duration. That way I could see if I'm training too much or not enough and the relationship between quality and quantity that I know I need to perfect in order to achieve my cycling goals.

It would also be really handy to be able to add in information about injuries, although that is a more advanced request.

Cheers