Assign one or more muscle groups to each exercise

To keep track of training volume per muscle group, I would like to be able to assign one or more muscle groups to each exercise, along with the involvement of each muscle group. So what I have in mind is one or more primary, secondary and tertiary muscle groups which will then count as 1, 1/2 and 1/3 sets towards the volume of each muscle group.

For example Bench press would be primary chest and secondary front delts and triceps. So each set of Bench press would count 1 set for chest and 1/2 set of front delts and triceps.

And squats could be 1 set for quads and glutes and 1/2 set for low back.

And on the analyze page, it would be a list of muscle groups and I could go into each muscle group and see the total volume per week, month etc. in number of sets, tonnage etc.