Is there a way to count total number of items defined in Enum?

I am trying to count the number of items defined in my enum (iota) in Go, but I am unsure of how to do that.

For example, ILen and XLen,

package main
import "fmt"
const (
	I1 = 1 << iota
	I2
	I3
	ILen int = iota
)
const (
	X1       = "A"
	X2       = "B"
	X3       = "C"
	XLen int = iota
)
func main() {
	fmt.Println(I1, I2, I3, ILen)
	fmt.Println(X1, X2, X3, XLen)
}

https://go.dev/play/p/krBVid3jLNq

1 2 4 3
A B C 3

> The Go Programming Language Specification
>
> Iota
>
> Within a constant declaration, the predeclared identifier iota represents successive untyped integer constants. Its value is the index of the respective ConstSpec in that constant declaration, starting at zero.