Node.Js Express views path with sub routing

I have a sort of this kind of folder structure for my node.js Express application:

/app
  /app_api
  /app_srv
    /routes
      /uri_a
        index.js
      /uri_b
        index.js
      /...
      index.js
  /uploads
  /views
  /...
  app.js

Abstractly

Each /uri_x/index.js is exported as an express.router() module and define the middleware to handle the http methods for that specific uri

The /routes/index.js is also exported as an express.Router() that import the routers from each /uri_x/index.js and set the use for that specific uri

app.js imports the \routes router and set it as the route handler for the application routes i.e. app.use('/', app_router)

/routes/uri_a/index.js

import express from 'express';

const appa = module.exports = express.Router();

appa.get('uri_a', (req, res, next) => {
  ...
};

/routes/index.js

import express from 'express';

import appa from './a_uri';

const app_router = module.exports = express.Router();

app_router.use('/a_uri', appa);

app_router.use('/', (req, res, next) => {

  //render start page
};

app.js

import express from 'express';

import path from 'path';

// ...

import app_router from './app_srv/routes';

// ...

/** here is where is going to be the to be or not of the question **/

app.set('views', path.join(__dirname), 'app_srv' ,'views');

app.set('view engine', 'pug');

// ...

app.use('/', app_routers);

// ...

Everything seam to work seamlessly excepto for that the __dirname changes for each uri_x location loosing the path for folders set in app.js with app.set as is the case for /views (and also /uploads).

I guess this happens because each uri sub folder is acting as a sub application which _dirname becomes e.g. c:\app\app_srv\routes\uri_x

It has took a lot of effort to get here and now, before I start changing the application folder structure, repeating the path set in each module, or change to absolute paths, while it is plausible that other solution exist which I am not being able to find;

please...