Is it possible to get Enum name without creating func (TheEnum) String() string in Golang?

const (
 MERCURY = 1
 VENUS = iota
 EARTH
 MARS
 JUPITER
 SATURN
 URANUS
 NEPTUNE
 PLUTO
)

or is there a way to define constants on the fly? I found two ways struct-based and string-based, but both way make us retype each labels 1 more time (or copy-paste and quoting or using editor's macro)