Get non-tabular data from web

How can I get non-tabular data from web pages? For instance,

Last price data from the following page:

or (4.31) value from the following

I’ve tried FILTERXML and WEBSERVICE combinations, but it did not work. I could do it in Excel via a third party tool “Seo Tools” and using ‘XPathOnUrl’ as below:


How can I implement in LibreOffice?