Help how to if-else graphic script output based on number of items selected in Local Data Filter

[#1]

Looking for professional advice. I have these 3 variables:  Y( :C ), X( :A, :B ) to be plotted in a Variability Chart.

1. If number of A selected in local data filter equals to 1, I would like the graphic display output to be as below:

Fill Color( "green" );
Transparency( 0.3 );
Rect( 0, 0, 1, 80, 1 );

2. If number of A selected in local data filter equals to 2, I would like the graphic display output to be as below:

Fill Color( "green" );
Transparency( 0.3 );
Rect( 0, 0, 2, 80, 1 );

I have a JMP Pro 16.1.0.

[#2]

You might have to utilize << Make Filter Change Handler.