Net assets over time seems like a stacked bar chart coz you want the totals (total net worth) segmented by accounts (colors)
The transfers almost seem sankey like but where the x axis is time?
So you sorta want to combine those two things.
You can label with with a “tip” in Plot. Tip mark | Plot
In my own work when I want to mix things together I use Robocoop, I load the canonical examples via an imports, and then give the AI the instructions to draw inspiration from the examples, there is a specific video on remixing an arc diagram: ( Roboco-op notebook coding assistent - #6 by tomlarkworthy )