Enhancement - Enable custom parser HtmlAgilityPack / JSON

[amirvenus]

Is your feature request related to a problem? Please describe.
I'm always frustrated when I cannot scrape a JSON endpoint for example the one provided by WordPress websites or I cannot understand how to scrape html based on the limited documentation of the current parser implementation while knowing myself accustomed to HtmlAgilityPack

Describe the solution you'd like
Enable JSON crawling and/or custom html parser implementation

Describe alternatives you've considered
I have considered using the postprocess but then it means that many of the core features of the library will not be used at all