I don't think you need to concentrate on templates for this. You can use Formatter for this.
Create your own formatter in Windows > Preferences > Java > Code Style > Formatter
and enable Save Actions in Windows > Preferences > Java > Editor > Save Actions
(Select Format Source code and Format all lines options) and here you choose your formatter created before.
Once you insert the logger template editor becomes dirty then save the editor(press Ctrl + S) then automatic indentation will happen as per the settings in formatter.
Refer this and this for formatter creation. In Indentation tab use the number of space you like. I used Tab Policy = Spaces only and Indentation size = 4
.