Hi there and welcome to the Community, @user28069 
Thank you for the feedback!
We’ve mentioned before that the Provenexpert source may be considered in the future, especially if there is increased interest from users. However, we’ve never promised its release in the next update to avoid false expectations.
If we receive any news about the Provenexpert source request, we’ll update you in this thread 
As for the Trustpilot source, unfortunately, we won’t be able to add it to the widget because of the continuous dispute with Trustpilot. I am really sorry 
Feel free to check this discussion for more details - Where are Trustpilot reviews? [And why we won't add them]