At least with their previous features it's been possible to set the address to any custom services you may have running, remote or local. For example Against all expectations I had I've actually found the highlight -> explain tool to be useful when sent to my local vLLM instance with a template I like.

Why not google/ddg/bing etc. them? That's on the context menu too, but LLMs seem uniquely suited at some problems like acronyms that are shared across many fields but different meanings, highlighting a sentence turns out the right acronyms very fast where search engines would take several attempts and is what I used to do previously.