Extract data from hidden fields

Good evening, I am a begginer in webscrapper. I'm having difficulties extracting the contact (phone) from the ads because that information is hidden. Can anyone give me a hand?

Thanks

Url: https://www.idealista.pt/comprar-casas/lisboa/

Sitemap:
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@Tomas Hi, it should be possible by using an 'Element click' in a combination with 'Text' selector.

Example:

{"_id":"test-idealista","startUrl":["https://www.idealista.pt/imovel/31989891/"],"selectors":[{"clickElementSelector":".hidden-contact-phones_link span.hidden-contact-phones_text","clickElementUniquenessType":"uniqueText","clickType":"clickOnce","delay":2000,"discardInitialElements":"do-not-discard","id":"phone-click","multiple":true,"parentSelectors":["_root"],"selector":"body","type":"SelectorElementClick"},{"id":"phone","multiple":false,"parentSelectors":["_root"],"regex":"","selector":"a.hidden-contact-phones_formatted-phone","type":"SelectorText"}]}

If the phone number is available within the HTML code without having to click the 'reveal' button you can also create the selector manually.