Do you want to know how to add a node alias in a twig file?  Rather than do the set up in a custom module or using your theme file. To be able to create a node alias in a twig file you need to know the node.nid value.  Obviously without it you have nothing to reference from.  In this example, the node.nid value is extracted during a loop.  A fairly standard loop such as {% for row in rows %} // ... script doing some magic ... // {% endfor %}Begin by setting the nid value...