This can be done by explicitly specifying the underlying table as a recipient of << Graph Builder in the expression of the hover label command:

Names Default to Here(1);
new namespace("myNs");
myNS:dt = Open( "$SAMPLE_DATA/Big Class Families.jmp" );
myNS:dt << Summary(
Group( :sex )
);
Graph Builder(
Variables( X( :sex ), Y( :N Rows ) ),
Elements( Bar( X, Y, Legend( 3 ) ) ),
SendToReport(
Dispatch( {}, "Graph Builder", FrameBox,
{Set Graphlet(
Picture(
myNS:dt << Graph Builder(
Size( 656, 556 ),
Show Control Panel( 0 ),
Graph Spacing( 4 ),
Variables( X( :height ), Y( :weight ) ),
Elements(
Points( X, Y, Legend( 3 ) ),
Smoother( X, Y, Legend( 4 ) )
)
)
)
)}
)
)
);