Sankey diagrams do not support non-ASCII characters

[bigyihsuan]

Describe the bug
When writing a Sankey diagram, you cannot use Unicode characters.

To Reproduce
Link to Live Editor
Steps to reproduce the behavior:

1. Make a Sankey diagram with sankey-beta.
2. Use a Unicode anywhere.
3. See an error that says that it was not expecting NON_ESCAPED_TEXT.
4. The error will not go away until all non-ASCII characters are deleted or replaced with ASCII.

Expected behavior
I expected to be able to use any Unicode character as a field name, whether directly or in quotation marks.

Screenshots

sankey-beta

a,b,1
á,b,1
b,ŋ,3

Desktop:

• OS: Windows 11 23H2 22631.3880
• Browser: Chrome 127.0.6533.72
• Version: 10.9.1

Additional context
Putting the Unicode text in quotes does not fix the problem like escaping commas with quotes.