Paginator does not return main Output Formats URL

Currently while calling the paginator from list.json.json while json is the main Output Format:

{{- $pagi := $.Paginator 5 -}}

$pagi.URL, $pagi.Next.URL etc…, will not return the output formats version of the url (/whatever/page/2/index.json) but the default one (/whatever/page/2/)

Is there a way to specify which Output Format such URLs need to return?