Custom zoom in kobo aura one

[calamitywalking]

I am wondering if it is possible to input a custom zoom for pdfs, currently clicking on the plus or minus icons changes the zoom by 50%. (using the standard kobo software)
I want to do smaller changes, something like 3% for example. It is very difficult to do this by moving the icon with your fingers and impossible with 2 finger pinches.
I tried looking for zoom in the kobo setting ini file but could not find it.


Alternatively, is there away to perhaps input the zoom level with the touch keyboard?


Thanks for any replies.