It is very strange that while the Gantt component is similar to the gorgeous Grid component, support for row and header templates has not been released.
We await implementation
<GanttColumn>

  <HeaderTemplate Context = @ myContext>

  </HeaderTemplate>

  <Template Context = @ myContext>

  </Template>

</GanttColumn>

**Admin Edit**

Will be released in 3.1.0.

**Admin Edit**