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:
http://fundturkey.com.tr/FonAnaliz.aspx?FonKod=TPZ

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:

=XPathOnUrl(“http://fundturkey.com.tr/FonAnaliz.aspx?FonKod=TPZ","//[@id=‘MainContent_PanelInfo’]/div[1]/ul[1]/li[1]/span")
=XPathOnUrl("https://untappd.com/HillFarmsteadBrewery","//
[@id=‘slide’]/div[3]/div/div[1]/div/div[2]/p[1]/span[2]”)

How can I implement in LibreOffice?

Thanks.