In case it helps anyone, here's the steps I followed:
1. Navigate in your browser to https://www.gisinternals.com/
2. Download stable x64 version (e.g. I got release-1911-x64-gdal-3-0-0-mapserver-7-4-0.zip) and unpack to a folder. This assumes you are using 64-bit build. For 32-bit there's an x86 version available instead, but I haven't tried it.
3. Create a Plugins/GDAL folder under your Assets folder in Unity
4. In unpacked folder, go to bin/ and copy any .dll file to Assets/Plugins/GDAL folder
5. Go to bin/gdal/csharp/ and copy any .dll file to Assets/Plugins/GDAL folder
6. Go to bin/ms/csharp/ and copy any .dll file to Assets/Plugins/GDAL folder
And that should pretty much do it.
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