You want to import text testimonials.
Currently you can import text testimonials manually, one at a time, or bulk upload them: How can I bulk import testimonials with CSV or XLS?
Senja
Go to https://app.senja.io/
1. Click on Import Testimonials
2. Click on Text Testimonial
This page will be loaded by default
3. Copy and paste the testimonial details
4. Here's where you add the text testimonial
5. Click on Import testimonial
Your testimonial will be added