Is it possible to use the blocks.registerBlockType filter from within the theme?

Hi quick question. I am trying to override the core/button html from within a theme that I am creating and I'm want to use the blocks.registerBlockType filter to alter the HTML for the block. Im stuck trying to figure out why the function overrideButtonBlock (in code below) isn't running.

Heres what my index.js looks like.

import { addFilter } from '@wordpress/hooks';
import Edit from './edit';
import Save from './save';

console.log('Loaded') // Outputs to the console;
const overrideButtonBlock = (settings, name) => {    console.log('Attempting to override button block') // Never outputs to the console;
    if (name !== 'core/button') {
        return settings;
    }

    console.log('overrideButtonBlock function is running');
    return {
        ...settings,
        edit: Edit,
        save: Save,
    };
};

addFilter(
    'blocks.registerBlockType',
    'my-plugin/override-button-block',
    overrideButtonBlock,
    100
);

And my functions.php file

function enqueue_block_extensions() {
    wp_enqueue_script(
        'core-button-extension',
        get_template_directory_uri() . '/js/build/blocks/buttons/index.js',
        array( 'wp-blocks', 'wp-element', 'wp-i18n', 'wp-editor', 'wp-hooks', 'wp-dom-ready' ),
        filemtime( get_template_directory() . '/js/build/blocks/buttons/index.js' ),
        true
    );
}
add_action( 'enqueue_block_editor_assets', 'enqueue_block_extensions', 20 );