Hello Ernesto Ruiz,

You can do it by creating a new char field widget i.e,

py file: facebook_url = fields.Char()

xml file:

To do so, You have to write a javascript code something like as below,

var ImageCharField = FieldChar.extend({

init: function () {
this._super.apply(this, arguments);
this.image_src = this.nodeOptions.image_src;
},

_renderImage: function() {
// place position as per your need {after/before}
this.$el.prepend(` height='20'/>`);
},

_renderEdit: function () {
this._renderImage();
return this._super.apply(this, arguments);
},

_render: function () {
this._renderImage();
this._super.apply(this, arguments);
},
});

field_registry.add('imagechar', ImageCharField);

Thanks & Regards,
Email: odoo@aktivsoftware.com
Skype: kalpeshmaheshwari