How to Add Buttons in Notifications only with json Code?

{
“to”: “dGe6KCewQua9IvM6m6XzXJ:APA91bH-B4EJDQGgdI_U2WLVfHuhRKc85e7aPQYHkQqC8iZi8envu1HI03JdPwNU9e7jmIjY8AETEf546dJwv2-a210hXlolIK1qTHjSQ8XKRiuCEuKRYLRpNkSODgtm9t9NMUlgSC6i”,
“notification”: {
“buttons”: [
{
“action”: “like-button”,
“title”: “Like”,
“icon”: “https://images.all-free-download.com/images/graphicthumb/a_bouquet_of_red_roses_picture_166753.jpg”,
“url”: “https://www.javatpoint.com/
},
{
“action”: “read-more-button”,
“title”: “Read more”,
“icon”: “https://images.all-free-download.com/images/graphicthumb/a_bouquet_of_red_roses_picture_166753.jpg”,
“url”: “https://www.javatpoint.com/
}
],
“action”: “like-button”
}
}

This was my Code, I’m getting notifications but I’m not getting button in that. I’m not using Android Studio. I’m using Pega Application and Firebase Console.