How to automatically change the data values color?

There's currently no option to do that, but it is possible to set the values to only inside / outside if you need.

The other alternative I found is a work-around. It's possible to format the colour of the data labels conditionally... but this point in time, I can't apply the condition of whether the point is inside or outside the bar.

Instead, I was able to split my measure into two - "small" values and "big" value

s and create a chart with them both. 

I can then format the position of the data labels on each separately.

Measures used in the chart:

Data Label Settings:

Resulting chart:

HTH 

Pi