WooCommerce Admin Solely Electronic mail Hook

I am utilizing this to switch the e-mail that’s despatched to our shopper for his or her information, however I do not need the identical data exhibited to their buyer bill.

add_action( "woocommerce_email_order_details", "wc_get_transaction");

perform wc_get_transaction( $order ) {
    echo '<span model="colour:#555;font-size:1.5em;">Transaction ID: '.get_post_meta( $order->id, "_transaction_id", true ).'</span>';

}

I attempted this:

if ( ! $sent_to_admin ) {
    add_action( "woocommerce_email_order_details", "wc_get_transaction");

    perform wc_get_transaction( $order ) {
        echo '<span model="colour:#555;font-size:1.5em;">Transaction ID: '.get_post_meta( $order->id, "_transaction_id", true ).'</span>';

    }
}

Does not work although. I am utilizing this in my features.php

How can I get this so it solely sends to the admin?