Amarok https://www.gl-inet.com/products/gl-x1200/ is not listed in supported devices, but I understood most gl-inet devices are very similar to OpenWRT since they are based on it, but getting it to work is a hassle right if it's not officially supported?
If it's not explicitly listed as supported by OpenWrt in our own ToH, then it isn't - I wouldn't suggest to draw any conclusions beyond that.
You could ask in the GL.iNet forum or directly at GL.iNet if there are any plans to submit a PR for adding official OpenWrt support.
You may be interested in these two threads:
Sorry, both are a tad old.