Ive been hit three times on different boats Ive owned.
It all depends on
.... if the lightning was an amperage event - blowing large chunks out of the keel / hull (starburst cracks, etc.) / throughhulls, etc. (once)
.... OR
Radio Frequency RF events .... just the electronics fried (once)
... or a combo of both plus all the wiring also gets melted (once).
A boat in my marina got hit ... and the only evidence of the strike (besides the missing
VHF antenna) was that the ALL the underwater surfaces of the inside hull were 'sweating' ... from a zillion macroscopic holes.
Like another poster stated .... advise the surveyor AND the insurance carrier. Of course when you buy, make the boat acceptance subject to passing survey.