@DerekMStrout -- This is already possible with a bit of manual configuration. You can set the height of an embed by using iframe code. This blog has more info in the "Link vs. iframe code" section.
Essentially, you set the iframe width to 100% and then can set the height in pixels. You'll also likely want to force the mobile view the dashboard to show by adding "#view=mobile" to the end of the URL.
See the example below.
<iframe src="https://www.arcgis.com/apps/dashboards/eb93a3afad534c4498e02e78d3d74d98#view=mobile" width="100%" height="800px" />
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