Here’s a workaround:
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Create a Section Player > Piano
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Set the following Layout Options:
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Write your music (three separate flows).
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Create a Divisi at the start of your first flow. This bit’s tricky: you have to fool Dorico by creating an additional division, then deleting it. Only then will Dorico let you edit the name.
- Alt+Click the Divisi signpost to the start of each flow, then double-click it and replace the “1” with a “2”.
Sure, this isn’t automated, but it’s much more stable than using Shift+X text and dragging it into place - the number will always be where it should be.