What I’m trying to do
I’m trying to set up the Time ruler plugin to show only tasks that are in files with the #todo tag.
In the setting there’s 3 options
- Custom filter
- Filter Function
- Task filter
But I can’t find out which dataview syntax I have to use, nor the difference between this 3 options.
Things I have tried
I read carefully the documentation setting and the dataview syntax guide,
and watched a Dataview beginner’s tutorial for obsidian. I’ve learned a lot, but I still don’t have any clue what do I have to write and where 
There only one topic open now about Time ruler setting, that’s doesn’t answer the question so far…
Any help is very welcome !!