This presentation is quite old but might provide some helpful information on writing dashlets using Aikau (from slide 77 onwards).
We haven't done much with Aikau dashlets since this presentation was put together (because there hasn't been a lot of demand for it). At some point we will probably put together a pure Aikau dashboard, when this happens and whether or not it will be used in Share is another issue though.
FYI: I've written a blog post which provides some useful information on writing dashlets using Aikau.
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