Adding ‘searchParams’ arguments to plugin request

I have been able to customise the results returned by the ‘layer’ by adding this code to the ‘Layer Javascript Code’ option…

searchParams: {
"query_name": "match_or"
}

…but now the results shown in the layer don’t match the ‘internal search’ results. Is there a way within the plugin to modify the API query with custom ‘searchParams’ arguments? I can’t see anything in the app.doofinder.com dashboard that will allow me to do this either, only the documentation for creating new API calls.