There is no feature to display additional or different data with spyglass; it only supports the icons and data listed:
shipname,
shiptype,
fRelativeHP,
fRelativeSP,
nShipCrew,
fShipSpeed,
fSailTo,
nCurCannons,
nMaxCannons,
nCharge,
nNation,
nSailState,
nFace,
nFencingSkl,
nCannonSkl,
nAccuracySkl,
nNavigationSkl,
nBoardingSkl,
captainname,
facetexture,
nShipClass