I'm not sure if this is possible, if it is could someone please tell me how to...

I would like to trigger a title overlay every time the text changes in the data source.

Thanks,

me think its a slippery slope as depending to how fast data changes it would look like one could easely loose control on how frequent the overlay happens.
if data changes very frequently imo having the overlay stay put looks much nicer that the frequent appering and disapearing of the overlay showing the changes

that said if one really needs this in the odd occasion i personaly would program it in the title itself with databinding ; execute a function like an animation based on the data (change) .
we often animate parts of the overlay based on values of the datasource, granted the overlays are specific to our data functionality and functions. takes a bit of prepping but in the end well worth it

full automations can be sweet but i prefer having manual overide available still

As titles are basically elements that are shown or not you could easely incorporate that in a bit of scripting witin the title code.
There have been a few examples in the forum to change colors for example based on values of a text field , why not add some code to show all the elements for a while and then hide based on ifchanged element ?

once designed you would not have to worry about it anymore and be able to focus on the data and rest of the production.

here is an example where elements apear and disapear based on values ( lower right ) and hide the title when time is reset (will reapear when clock starts running)

Personally i am happy vMix allows to do some DIY :-)