How to make a single background (linear gradient) for all Scenes in Phaser 3?

Question

JavaScript

Now on the initial Scene in the create() method I do the following to create a background :

this.background = this.add.graphics();
this.background.fillRect(0, 0, 180, 320);
this.background.fillGradientStyle(0x8e44ad, 0x8e44ad, 0x2980b9, 0x2980b9);

But this only works for the current Scene . How to make a common background (linear gradient) for all Scenes ?
Does Phaser 3 have a ready-made method/solution for this, or can you suggest an elegant solution?