This is a simple example to use ANY in golang which is an alias for interface{}, therefore easy to read

any.go

#################################################
## EXAMPLE OF USAGE OF ANY IN AN OBJECT/STRUCT ##
#################################################
package main

import "fmt"

const (
	MALE   string = "male"
	FEMALE string = "female"
)

type WildAnimal struct {
	Name   string
	Specie string
	Gender string
	Habit  string
}

type Animal struct {
	Name   string
	Specie string
	Gender string
}
type Person struct {
	Name    string
	Surname string
	Animals []any
}

func main() {
	dog := Animal{
		Name:   "Rex",
		Specie: "Dog",
		Gender: MALE,
	}
	cat := WildAnimal{
		Name:   "Hope",
		Specie: "Tiger",
		Gender: FEMALE,
		Habit:  "Jungle",
	}

	me := Person{
		Name:    "Pedro",
		Surname: "Bertão",
		Animals: []any{dog, cat},
	}

	fmt.Println("Hi, I'm @pedrobertao ")
	fmt.Println("I have two pets")
	fmt.Printf("One is a %s named %s \n", me.Animals[0].(Animal).Specie, me.Animals[0].(Animal).Name)
	fmt.Printf("And also I have a %s named %s that lives in the %s. \n", me.Animals[1].(WildAnimal).Specie, me.Animals[1].(WildAnimal).Name, me.Animals[1].(WildAnimal).Habit)

}

#################################################################
##                            Output                           ##                               
## Hi, I'm @pedrobertao                                        ## 
## I have two pets                                             ##
## One is a Dog named Rex                                      ##
## And also I have a Tiger named Hope that lives in the Jungle. ##
#################################################################