 If the value that you‚Äôd like to format corresponds to an axis, you can use <code>*axis.hoverformat</code>. The syntax behind <code>hoverformat</code> follows d3js‚Äô format conventions. For numbers, see: <a href="https://github.com/d3/d3-format/blob/master/README.md#locale_format" class="uri">https://github.com/d3/d3-format/blob/master/README.md#locale_format</a> and for dates see: <a href="https://github.com/d3/d3-time-format/blob/master/README.md#locale_format" class="uri">https://github.com/d3