Hi Damian,
Thank you for contacting Syncfusion support.
We have checked your query “How to update caption summary template view text in run time.” we have assigned value in converter for caption summary template view it cannot be called in runtime.
However we are trying to update the caption summary template view text in runtime. we will update you further details on March 1,2019. we appreciate your patience until then.
Regards,
Pradeep Kumar B