Some Questions about "Style" in Graph Builder

[#1]

1)  When I use Style as Overlay encoding, how can I specify the "Theme" of the markers, e.g. to use hollow or markers?
[similar to the Graph Marker Theme setting in the Preferences]

dt = Open( "$SAMPLE_DATA/Big Class Families.jmp" );
Graph Builder(
	Size( 398, 333 ),
	Show Control Panel( 0 ),
	Graph Spacing( 4 ),
	Variables( X( :height ), Y( :weight ), Overlay( :age, Overlay Encoding( "Style" ) ) ),
	Elements( Points( X, Y, Legend( 17 ) ), Smoother( X, Y, Legend( 18 ) ) )
);

[#2]

2)

I use markers very often to distinguish different variants.
Sometimes, I  have a second yes/no information and I and want to use hollow: yes/no to show this info in the plot.
here: the first/last data point per group.

In Graph builder, is it possible to use one column (age) for MARKER - and another column (first or last) for HOLLOW: yes/no?

Names Default to Here(1);
dt = Open( "$SAMPLE_DATA/Big Class.jmp" );
New Column( "first or last",
	"Nominal",
	Formula(
		:height == Col Min( :height, :age ) | :height == Col Max( :height, :age )
	)
)