Use a Shortcode to prevent SearchWP from indexing partial content, see https://searchwp.com/docs/kb/prevent-indexing-segments-content/

gistfile1.php

<?php

// tell SearchWP to process shortcodes
add_filter( 'searchwp_do_shortcode', '__return_true' );

// if the SearchWP indexer is running prevent returning the
// content between [searchwp_no_index] and [/searchwp_no_index]
function shortcode_searchwp_no_index( $atts, $content = null ) {
	// if the searchwp_indexer_running action fired, the indexer is running so don't return anything
	return did_action( 'searchwp_indexer_running' ) ? '' : $content;
}

add_shortcode( 'searchwp_no_index', 'shortcode_searchwp_no_index' );