Right Origin

class Example extends Phaser.Scene
{
    create ()
    {
        const graphics = this.add.graphics();

        graphics.lineStyle(1, 0xffffff, 1);
        graphics.lineBetween(400, 0, 400, 600);

        this.add.text(400, 200, 'His ugliness was the stuff of legend.', { color: '#00ff00' });

        //  To right-align a _single_ line of text, use the origin:
        this.add.text(400, 400, 'His ugliness was the stuff of legend.', { color: '#00ff00' }).setOrigin(1, 0);
    }
}

const config = {
    type: Phaser.AUTO,
    parent: 'phaser-example',
    width: 800,
    height: 600,
    scene: Example
};

const game = new Phaser.Game(config);