我已经设法使用User-defined Function获得了所需的内容

/**
 * ArangoDB User-defined Function for getting the last
 * vertex of a collection type in a graph path
 *
 * @param {Path} path ArangoDB graph path to search
 * @param {string} type Name of collection that the returned
 *   vertex should be from
 */
const lastOf = (path, type) => {                                                                                                                                                                                                                                                                                                                                                           
  type += '/';
  
  for (let i = path.vertices.length - 1; i => 0; i--) {
    if (path.vertices[i]._id.startsWith(type)) {
      return path.vertices[i];
    }
  }

  return null;
};

我在建立数据库连接时注册了该数据库

import { Database } from 'arangojs';

const database = new Database({
 ...
});

...

await database.createFunction('MY_FUNC::LAST_OF', lastOf.toString(), true);

然后在AQL查询中使用

FOR path
  IN 1..100 OUTBOUND K_PATHS
  'assets/493761' TO 'assetTypes/radio'
  GRAPH assetRelationships
  RETURN MY_FUNC::LAST_OF(path, 'assets')