How to add an inline image to the end of a string in a TextArea in JavaFX?

I am trying to add an emoji to my chat program when my client types :)

I am trying to add this in the FXML controller. I have captured when the user types :) using the following code snippet :

if(chat.contains(":)")) {
    ...
} 

My chat is printed into a textarea named taChat

taChat.appendText(chat + '\n');

Any help is appreciated!