The chart title should be treated as "real" wiki text so that bold, italic and links are possible.
See https://commons.wikimedia.org/wiki/Data:GhostInTheMachine/Test.chart
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Description
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This is likeky not only chart titles, but any other text included the chart as well, such as labels and legends.
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Is the chart title an i18n message, and is https://www.mediawiki.org/wiki/Manual:Messages_API#Output_modes_and_escaping related to this bug?
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Treating this as a new feature request.
Based on the examples at https://www.mediawiki.org/wiki/Extension:Chart, Wikitext titles can be provided as argument to the parser function used to add a chart to a page, but embedding wikitext in chart JSON is not currently supported.
{{image frame
|content={{#chart:Example.Line.chart}} [[commons:Data:Chart Example Data.tab|'''Raw data''']]
|width = 340
|caption = This is an example of a line chart.
}}