Here are some screenshots.
Basically add your input to channel list
EQ Wins 1.png
Transform
EQ Wins 2.png
Under EQ ratio find your wideband
EQ Wins 3.png
Should look like this
EQ Wins 4.png
Now back in the channels list if you right click on your WB you can change the units to be based on some common stoich values. Say, 14.7
EQ Wins 5.png
To use this in a chart, add the wideband like normal.. the EQ ratio one
EQ Wins 6.png
Under units you have the same options for unit you did earlier. Pick whatever you want, 14.7 obviously is common one
EQ Wins 7.png
You can also add another parameter for lambda if you want. And you should end up with something like this. AFR and lambda, side by side off of one input.
EQ Wins 8.png