You need to have some actual coordinates for your diagram. After that you can manipulate a point diagram to display it the way you want using the formatting options. At least for two dimensions (you could view your trend as a third) this works.
Lets assume that each value has a numeric XY coordinate available that ranges between 0.0 and 3.0 (as you have three major regions). With that assumption half intervals would be the middle of a field.
Create a new diagram and setup the data area using two dimensions. After that check the Layout options in order to set the axis format with a fixed minimum of 0.0 and a fixed maximum of 3.0 for both axes. Now you have your Layout.
In a more visual way you would do the following:
Setup the Initial data with the index values (you might be able to use conditional formatting for the icons later on):
Setup the data rows for the point graph:
Navigate the axis options and set a fixed interval for both axes:
Enable the drawing of main grid lines and enable the display of information for data points:
As you can see, it's not a complete solution but it might be a starting point.
One option to get the "third" dimension would be to setup a data row for all positive/neutral/negative entries and assign a marker type for those that corresponds to the icon you want. Depending on the number of entries it might also be possible to setup a row for each entry which would mean you would be able to use the row name as a description for the point.
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) to format it. (You can of course obfuscate the data in your Stakeholder column, so you don't show anything confidential). Vielen Dank!