Example of yaml marshal with inline map[string]interface

main.go

package main

import (
	"fmt"

	"gopkg.in/yaml.v3"
)

type Person struct {
	ExtensionProps map[string]interface{} `yaml:",inline"`

	Name string `json:"name" yaml:"name"`
	Age  int    `json:age" yaml:"age"`
}

func main() {
	ext := map[string]interface{}{
		"x-something-important1": "TEST",
		"x-something-important2": "TEST",
	}

	p := &Person{
		Name:           "TEST",
		Age:            200,
		ExtensionProps: ext,
	}

	y, err := yaml.Marshal(p)
	if err != nil {
		fmt.Printf("err: %v\n", err)
		return
	}
	fmt.Println(string(y))
}