Yes, if you have external audio systems connected to your playback device, Disney+ will detect and deliver the highest-quality audiop that the system can support.
To enjoy the highest-quality Disney+ experience, all components, including HDMI cables, should support high-bandwidth digital content. External displays should support HDCP 2.2 for 4K Ultra HD and HDR content. Older audio and video components can have an impact on quality or possibly prevent playback entirely.
Consult with the device manufacturer for capabilities of your specific device(s).