Custom Source Link from LEX synced with Kendra

Hi, We have a Lex and Kendra Setup here our Lex and Kendra is synced so if LEX is unable to give a direct answer it give this search to Kendra and Kendra is Giving answer with a Source link, That source link is contaning a S3 URL with a Token, But here we want Lex gives answer from Kendra but it must give a custom URL, which is associated with our Bucket and have Cloudfront with it. In Below image

there is a Source link, if i click on this link it directly open a S3 URL for our Existing file. Due to that S3 link our bucken name publicly open, We already created a Cloudfront and a subdomain for that and we want Lex should give us Our Costom domain not direct S3 link.

Thanks