effect(name) / effect(index)
effects finds the effect by its name in the Effect Controls panel.
The name can be the default name or a user-defined name.
If multiple effects have the same name,
the effect closest to the top of the Effect Controls panel is used.
example:
- effect("Fast Blur")("Blurriness")
issue: https://github.com/thorvg/thorvg/issues/3115
