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function block_core_post_terms_build_variations() {
	$taxonomies = get_taxonomies(
		array(
			'publicly_queryable' => true,
			'show_in_rest'       => true,
		),
		'objects'
	);

	// Split the available taxonomies to `built_in` and custom ones,
	// in order to prioritize the `built_in` taxonomies at the
	// search results.
	$built_ins         = array();
	$custom_variations = array();

	// Create and register the eligible taxonomies variations.
	foreach ( $taxonomies as $taxonomy ) {
		$variation = array(
			'name'        => $taxonomy->name,
			'title'       => $taxonomy->label,
			'description' => sprintf(
				/* translators: %s: taxonomy's label */
				__( 'Display a list of assigned terms from the taxonomy: %s' ),
				$taxonomy->label
			),
			'attributes'  => array(
				'term' => $taxonomy->name,
			),
			'isActive'    => array( 'term' ),
			'scope'       => array( 'inserter', 'transform' ),
		);
		// Set the category variation as the default one.
		if ( 'category' === $taxonomy->name ) {
			$variation['isDefault'] = true;
		}
		if ( $taxonomy->_builtin ) {
			$built_ins[] = $variation;
		} else {
			$custom_variations[] = $variation;
		}
	}

	return array_merge( $built_ins, $custom_variations );
}