Change template for JetThemeCore plugin based on the option value.

jet-theme-core-change-template.php

<?php

add_filter( 'jet-theme-core/location/render/template-id', function( $template_id ) {
	
	/**
	 * 123 - is ID of initial template you set in ThemeCore (could be found in adress bar)
	 * 'alternate-value' - is value of option which enables alternative layout for this page
	 * page-slug and option-name - there are option page slug and option name itself which are responsible for layout
	 */
	if ( 123 === $template_id && 'alternate-value' === jet_engine()->listings->data->get_option( 'page-slug::option-name' ) ) {

		// 321 - is alternative template, coud be anything - elementor templte, themecore template, listing template etc.
		$template_id = 321;
	}

	return $template_id;
} );