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Rank Math Canonical From an "Original URL" Field

Replaces the canonical URL with one saved in a custom field on posts republished from elsewhere.

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Code

// Custom field holding the original URL.
$wpide_rm_canonical_field = 'original_url';

add_filter( 'rank_math/frontend/canonical', function ( $canonical ) use ( $wpide_rm_canonical_field ) {
    if ( ! is_singular() ) {
        return $canonical;
    }

    $source = esc_url_raw( (string) get_post_meta( get_queried_object_id(), $wpide_rm_canonical_field, true ) );

    return wp_http_validate_url( $source ) ? $source : $canonical;
} );

Notes

Add a custom field named original_url with the full source URL.

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