How to Add text value in Automatically in this conditions?

This should work. Untested though.

I don’t know how you get $woocomerce_wookc_text, but since you mentioned CMB, I am taking you are saving it as product meta data

function wpse405916_add_to_cart( $cart_item_key, $product_id ) {
    
    //Get the woocomerce_wookc_text value.
    $woocomerce_wookc_text = get_post_meta( $product_id, 'woocomerce_wookc_text ', true );
    
    //Check if the value exists
    if ( $woocomerce_wookc_text && !empty($woocomerce_wookc_text) ) {
        //Set the value as integer
        $woocomerce_wookc_text = (int)$woocomerce_wookc_text;
        
        //Add it to cart
        WC()->cart->add_to_cart($woocomerce_wookc_text);
    }
}
add_action( 'woocommerce_add_to_cart', 'wpse405916_add_to_cart', 10, 2 );

This will automatically add the product associated with the id from $woocomerce_wookc_text when the main product is added to cart. There are numerous checks should be added.