Unicode support in the method add.text() of mne.viz.brain

[Jie Li]

Describe the new feature or enhancement

When I run the following command:
brain.add_text(0.1, 0.9, "chinese\u2190中文", color="black", font_size=10)

The added text only shows chinese, see below

However, I expect the added text to be chinese <- 中文. Would you please add this feature?

Describe your proposed implementation

I am not a Python expert, but I found that the Python package PyVista also has the method add_text() here. Maybe it can offer some thought on how to add this new feature.

Describe possible alternatives

None.

Additional context

No response

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