Can I use Chromecast to watch Disney+?

Disney+ supports Chromecast casting from:

For the best experience, we recommend a high-speed Internet connection. 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.