The end of line trend indicator can provide an effective visual hint in dashboard.
Sometimes your axis is busy with dual charts. So you don't have the luxury of using dual axis to create an end-of-line trend indicator. Here we are going to show that you don't need dual axis to do that.

The trick is easy: put it inside the Label.

This is how the last variance is calculated:
Put it in the Label:

Here are a couple variants of implementation:
- Custom Number formatting ;●;
Select red color for the font in the Label. If you want to use arrow to be the indicator, try this.
- Calculated field
The above is equivalent to a calculated field as follows [Last Delta Indicator]

• If [Last Delta]<0 then "●" end

Issue of alignment
There is a little issue of alignment if you want it to be perfectly on the data mark. We found a few ways to approximate the perfect alignment:
- Select middle and center alignment for the label.
- Use vertical font directions
- Adjust the axis scale so that the end point is not at the lower edge of the axis.
Here is a link to an example workbook. Try it.
That's it. Hope it works for you.