Does the GL-S20 support TREL? Is there any reason that it couldn't? It seems like the perfect device to support TREL given that it has an ethernet backhaul to the network. This is actually what I bought the device for - to extend an existing Thread mesh to an area which was isolated from the rest of the network where ethernet backhaul was the best option. But if TREL is not supported then this will not work 
TREL is supported by ESP Thread Border Router SDK which your firmware is based on: Enable TREL from menuconfig (TZ-425) · Issue #43 · espressif/esp-thread-br · GitHub
So I'd hope that this should be possible to enable without too much pain. Additionally, it looks like the issue that comment mentions about mDNS is resolved in this release.
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Hi, new features will increase system consumption. We will test them systematically before adding them. If there is a firmware update, we will notify you promptly.
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