Set up:
Something that may be relevant is that the Sharepoint is in spanish.
The script accesses a list to know if the current user has read the mandatory information. This list has a reader field and a objectToRead field, first a person, second a lookup that references SitePages.

My objective:
Getting the URL to the site from the lookup field with JS.

Preferably with one call to the API.

What I have:

import * as React from "react";
import {sp} from "@pnp/sp";
import styles from "./AppCustomizer.module.scss";
import { ITopUnreadListProps } from "./Iface/ITopUnreadListProps";
import { ITopUnreadListState } from "./Iface/ITopUnreadListState";

At the end of the constructor of the React app I call the following function, which changes the state an it updates the app:
(The following code does not give errors)

private async obtainRemainingMandatoryRead () : Promise<void>
        const shpList = sp.site.rootWeb.lists.getByTitle('mandatoryReadList');
        const currentUser : string=  this.props.ShpContext.pageContext.user.displayName;
        const filter = "(reader/Title eq '"+ currentUser +"') and (isRead eq false)";

        .select("Title", "reader/Id,reader/Title", "objectToRead/Title,objectToRead/Id") // Can I get the URL here?
        .expand("reader", "pageToRead")
            (row) => {
                let count = row.length;
                let items = row.map( (item) => { return { Title: item.pageToRead.Title}; } );

                if(count > 3)
                    items = items.slice(0, 3);
                this.setState( {list: items, itemCount: count} );

Is it possible to get the URL in with the select? Is there a naming wiki somewhere to know the field's names in the Rest API?

I have been trying with different names like FileRef, link, myLink, url, pageUrl, Path...(not even Name works) And searched for anything that could help. My alternative right now is to make a second call to the API.

The error that it gives (in spanish) is the following:

Uncaught (in promise) Error: Error making HttpClient request in queryable [400] ::> {"odata.error":{"code":"-1, Microsoft.SharePoint.SPException","message":{"lang":"es-ES","value":"La consulta realizada al campo 'objeto/Name' no es v\u00e1lida."}}}

(The query made to the field 'objectToRead/{WhateverItryToGetTheLink}' is not valid)

I have already seen this post:
Get File Url from a Lookup Column REST API

But those fields are not working for me.

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