Focus on doing the following movements lightly. The goal is to get some mobility and muslce control around your knee without increasing pain or symptoms. Ice can be used following for 10-15 minutes if you have any increase in soreness
the propping up of the foot protects the knee and should keep it more into a stretch for the ankle
This can be done also 8-15x
It can be done 3-5x/day as well
If this is going well you can also try it with a flat fot as shown below. The flat fot with put more stretch on the knee itself, just be careful with it