We don't have any built-in feature for that.
However, you can use any image editing tool (e.g. Canva, Visme, etc.), create your own 'template' for testimonials and just edit it later (adjusting by new texts and customer photos).
Also you can just take screenshots of Trust widgets with your testimonials, and publish them as needed.
As for video testimonials, you can download them from Trust and upload to any social media platform!