Remove sanitation on textarea field type for specific meta key when using WP Job Manager Field Editor (from frontend)

functions.php

<?php

add_filter( 'job_manager_get_posted_textarea_field', function(){
	return 'smyles_no_sanitize_textarea_metakey_handler';
});

function smyles_no_sanitize_textarea_metakey_handler( $key, $field ){
	$dirty = isset( $_POST[ $key ] ) ? trim( $_POST[ $key ] ) : '';
	$clean = isset( $_POST[ $key ] ) ? wp_kses_post( trim( stripslashes( $_POST[ $key ] ) ) ) : '';
	
	// Replace 'some_meta_key' with the meta key you want to allow dirty (unsanitized) value to be saved to listing
	return $key === 'some_meta_key' ? $dirty : $clean;
}

If you want to save value without sanitation in admin area use this code:
https://gist.github.com/tripflex/fca9ccda2315ab13bc390f41dcc6ba98