How to use the scratch-blocks.Colours function in scratch-blocks

if (menu.length === 0) {
                return [['', '']]; // Empty menu matches Scratch 2 behavior
            }
            return menu;
        }
        const myself = ScratchBlocks.ScratchMsgs.translate('CONTROL_CREATECLONEOF_MYSELF', 'myself');
        return [[myself, '_myself_']].concat(spriteMenu());
    };

    const soundColors = ScratchBlocks.Colours.sounds;

    const looksColors = ScratchBlocks.Colours.looks;

    const motionColors = ScratchBlocks.Colours.motion;

    const sensingColors = ScratchBlocks.Colours.sensing;

    const controlColors = ScratchBlocks.Colours.control;

    const eventColors = ScratchBlocks.Colours.event;

    ScratchBlocks.Blocks.sound_sounds_menu.init = function () {
        const json = jsonForMenuBlock('SOUND_MENU', soundsMenu, soundColors, []);
        this.jsonInit(json);
    };

    ScratchBlocks.Blocks.looks_costume.init = function () {
        const json = jsonForMenuBlock('COSTUME', costumesMenu, looksColors, []);
        this.jsonInit(json);
    };

    ScratchBlocks.Blocks.looks_backdrops.init = function () {

args0: [
                {
                    type: 'field_dropdown',
                    name: 'PROPERTY',
                    options: function () {
                        return menuOptionsFn();
                    }

                },
                {
                    type: 'input_value',
                    name: 'OBJECT'
                }
            ],
            output: true,
            colour: ScratchBlocks.Colours.sensing.primary,
            colourSecondary: ScratchBlocks.Colours.sensing.secondary,
            colourTertiary: ScratchBlocks.Colours.sensing.tertiary,
            outputShape: ScratchBlocks.OUTPUT_SHAPE_ROUND
        };
    };

{
                    type: 'field_dropdown',
                    name: 'PROPERTY',
                    options: function () {
                        return menuOptionsFn();
                    }

                },
                {
                    type: 'input_value',
                    name: 'OBJECT'
                }
            ],
            output: true,
            colour: ScratchBlocks.Colours.sensing.primary,
            colourSecondary: ScratchBlocks.Colours.sensing.secondary,
            colourTertiary: ScratchBlocks.Colours.sensing.tertiary,
            outputShape: ScratchBlocks.OUTPUT_SHAPE_ROUND
        };
    };