You'd probably need to download the Reference UI and customize the code yourself. This might help you get started if you want to do that: Reference UI - how to modify what's displayed (React newbie) - #2 by JasonStoltz
If you just want to know for some one-off requests what the score is, you can look at the API response body in your browser's network tab for the "http://localhost:3002/api/as/v1/engines/pokemon/search.json" request. Specifically, in the results field, each result has a _meta.score property.