To Increment by 10 simply remove the last digit and add a static zero.
Example
[[value1.toFixed(0).slice(0,-1)]]0
value1 is your dynamically changing variable
Here is a link to a working example I made. It doesn’t have the fill slider feature that you mentioned though.
https://forum.axure.com/t/slider-with-number-values/35235/5?u=josh_db
For the fill slider track, I would likely look to have a second slider track on top of the bottom slider track that dynamically changes width as you move the scroll button. That’s how I would do it. I don’t have time to add this into my file at the moment, but if you are able to understand what I did in my file, I’m pretty certain you can modify my file to achieve the fill slider track functionality.