concatinating SSRS Multivalue parameters with expressions

I am trying to display a multivalue parameters on a textbox and attaching some expressions to each instance of the parameter selected.

So far i have been able to use the =Join(Join(Parameters!subject.Value,",")) to display my parameters on a textbox and the result of this function is

matrixupdate, training completed, low sales, high turnover.

instead what i want to achieve is this using a count function with each parameter value diplayed.

matrixupdate:  35 , training completed : 68, low sales: 76, high turnover : 87.

Please HELP