How to get Nested Block Template for Custom WordPress Block.

Problem to Solve

While creating a Custom WordPress Block I would like to use other Blocks nested inside it such as Group Block and Columns block and further nested blocks.

Current Example with InnerBlocks in wordpress only has one Level.

const MY_TEMPLATE = [
    [ 'core/image', {} ],
    [ 'core/heading', { placeholder: 'Book Title' } ],
    [ 'core/paragraph', { placeholder: 'Summary' } ],
];

//...

    edit: () => {
        return (
            <InnerBlocks
                template={ MY_TEMPLATE }
                templateLock="all"
            />
        );
    },

Solution

An example I found on the internet that works is as follows.

export default function Edit() {
    return (
        <div { ...useBlockProps() }>
            <InnerBlocks
                template={ [
                    [ 'core/heading', { level: 2, content: 'Example Nested Block Template' } ],
                    [ 'core/paragraph', { content: 'Lorem ipsum dolor sit amet labore cras venenatis.' } ],
                    [ 'core/columns', {},
                        [
                            [ 'core/column', {}, [
                                    [ 'core/heading', { level: 3, content: 'Sub Heading 1' } ],
                                    [ 'core/paragraph', { content: 'Lorem ipsum dolor sit amet id erat aliquet diam ullamcorper tempus massa eleifend vivamus.' } ],
                                ]
                            ],
                            [ 'core/column', {}, [
                                    [ 'core/heading', { level: 3, content: 'Sub Heading 2' } ],
                                    [ 'core/paragraph', { content: 'Morbi augue cursus quam pulvinar eget volutpat suspendisse dictumst mattis id.' } ],
                                ]
                            ],
                        ]
                    ],
                ] }
                templateLock="all"
            />
        </div>
    );
}

Another related problem is designing the nested blocks in an array as used here is very difficult to design the first time. If there could be a way in which we design using blocks in the WordPress Gutenberg Editor and then Copy code and convert into array it here would make the task much much easier. Read more about it here.