If you have an actual device with Samsung Internet on it (currently available on the Play Store and Galaxy Apps store for Samsung Galaxy or Pixel/Nexus devices), you can remote debug it like this.
If you don't have a device, it was available on Browserstack when I checked a few months ago - but it's not currently on the free plan by the looks of it and we would need to confirm if they still offer it on their paid plans. When I checked, it was also available on other cloud device labs like TestObject. There's also Samsung's own Remote Device Lab. (For reference, there's a brief section here under "What if I don't have a Samsung phone?").
This Rough Guide includes some example device types from the Remote Device Lab that offer specific versions of Samsung Internet (last time I checked) if you want to test older ones.