i have a female bernese mountain dog that has two small brown marks on its muzzle [about the size of a 5p bit ] do you think these markings would come through on any pups were she to have any

Bernese have major health problems. Cancers are a serious problem and common cause of early death. Joint problems are common. Serious autoimmune problems and kidney problems are known.
There is much knowledge to be gained before breeding Bernese. If you join the breed club, and attend some shows, you will make contact with experienced breeders who will advise you about these problems, as well as the facial markings that are your concern.