subgraph's label style

If I create subgraph as follow,

subgraph cluster1 {
color = white;
label = "process #2";
b0 [shape=ellipse];

can I change style of label "process #2" to be bold?

Fill Style?

is there a way to define a fill style of nodes in dot?
I would like to make a replacement of colors in nodes with a style like "dotted", "plusses", ..
that are better viewable in blackwhite plots?
I did not found an attribute "fillstyle="
regards, Oscar

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