Add search settings
PATCH https://graph.microsoft.com/beta/external/connections/sampleConnectionId
Request Body
{"searchSettings"=>{"searchResultTemplates"=>[{"id"=>"graphApiMrt01", "layout"=>{"type"=>"AdaptiveCard", "version"=>"1.2", "$schema"=>"http://adaptivecards.io/schemas/adaptive-card.json", "body"=>[{"type"=>"TextBlock", "text"=>"[${title}](${url})"}]}, "priority"=>10000}]}}