For more information on Rive Text see the respective runtime and editor documentation.

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Update Rive Text in Unreal

A text run can be updated from an artboard instance by providing the text run name and new value: Image In the example above, we set the text run with name username equal to “Gordon”.
A unique text run name must be set in the editor to be discoverable at runtime. See the text runtime docs for more information.
This Artboard contains a text run with name username. A unique name makes it discoverable at runtime. Image Use the SetTextValueAtPath node to set a text run located in a component. Image