OptionalpageOptionalbold/F flag bit 2 — label drawn bold (present when read via GigaPdfDoc.outline).
Optionalitalic/F flag bit 1 — label drawn italic.
Optionalcolor/C RGB label colour, 0..1 per channel (black when absent in the PDF).
OptionaldestDestination fit type, lowercased ("xyz"/"fit"/"fith"/"fitv"/…).
Optionalx/XYZ top-left X (when destKind === "xyz").
Optionaly/XYZ top-left Y.
Optionalzoom/XYZ magnification.
One outline (bookmark) entry;
levelis the nesting depth (0 = top).