It's possible, as EspruinoHub just uses Node.js. I think the first step would be to plug a USB Bluetooth dongle in and try and access it using noble via node.js - you may need to use the @abandonware fork if you're on Node.js>10.
The Synology NAS doesn't actually need to have any Bluetooth functionality installed, it just needs to be able to make the USB device itself accessible - then Noble will be able to use it. I'm not sure how easy that'll be with Docker though.
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