TinyMCE - Custom Button for inserting a specific template

[Sasni]

I am using Prestashop 1.7.8.5. I have made several templates. Is it possible to prepare a button that will insert the selected template? For example, I have 4 templates and I want to make 4 buttons. the first button inserts the first template. the second button inserts the second template and so on. I tried to use this code in the file \js\admin\tinymce.inc.js but my new button is not displaying  

toolbar2: 'customInsertButton',
setup: function (editor) {
	editor.ui.registry.addButton('customInsertButton', {
		text: 'My Button',
		onAction: function (_) {
			editor.insertContent('My button works!'); 
		} 
	});
},

Perhaps Prestashop has some limited version of this editor? I ask because for example it is possible to add templates. but I would like to be able to insert them faster, with one button...

[Sasni]

I have already found a solution. It is possible by adding a custom plugin.