FieldTitle

Defines how Vega-Lite generates title for fields. There are three possible styles:

• "verbal" (Default) - displays function in a verbal style (e.g., "Sum of field", "Year-month of date", "field (binned)").
• "function" - displays function using parentheses and capitalized texts (e.g., "SUM(field)", "YEARMONTH(date)", "BIN(field)").
• "plain" - displays only the field name without functions (e.g., "field", "date", "field").