Note: this will be available in upcoming 3.4 release. For now you can get this functionality in pre-release version.
Since 3.4 when you select text you can send it to Google / Bing search engine or Google / DeepL translation web service:
You can also use command palette (Ctrl + K):

Adding more services

You can add more web services using advanced settings.
To configure an external reader:
Here's an example of adding DuckDuckGo search engine:
SelectionHandlers [
  [
    URL = https://duckduckgo.com/?ia=web&q=${selection}
    Name = &DuckDuckGo
  ]
]
URL is the website that will be launched. ${selection} will be replaced with (URL-encoded) current selection.
Name is what shows in the menu. You can use & characters to add Windows hot-key for keyboard-only invocation.

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