How to lock innerBlocks within a block variation?

I think I’ve figured this out. Instead of creating a block variation, I just created a brand new block using a block template.

import { registerBlockType } from "@wordpress/blocks";
import { useBlockProps, InnerBlocks } from "@wordpress/block-editor";

const BLOCKS_TEMPLATE = [
    ["core/heading", { level: 2, placeholder: "Heading" }],
    ["core/gallery", {}],
];

registerBlockType("logo-grid", {
    apiVersion: 2,
    title: "Logo Grid",
    icon: "smiley",
    category: "media",
    edit: () => {
        return (
            <div {...useBlockProps()}>
                <InnerBlocks
                    orientation="horizontal"
                    template={BLOCKS_TEMPLATE}
                    templateLock="all"
                />
            </div>
        );
    },
    save: () => {
        return (
            <div {...useBlockProps.save()}>                
                <InnerBlocks.Content />               
            </div>
        );
    },
});