Well... If transmission oil has not been changed in recent times, then it must be changed ASAP.
I believe, Toyota CVTF-TC is the recommended transmission oil for this CVT, still transmission oil filler bolt can guide best about the CVTF to be poured in (provided the bolt is original).
If "TC" is written on the filler bolt, then you need to pour Toyota CVTF-TC in it. If "FE" is written on the filler bolt, then you need to pour Toyota CVTF-FE in it.
As an alternative, you may also consider pouring https://www.caltex.com/content/caltex/pk/en/motorists/products/havoline-fully-synthetic-cvt-fluid.havoline-cars.transmission-fluids.html in it. It meets both requirements (i.e. TC and FE).
I poured this CVTF in my Vitz, and AL HAM DU LILLAH, its working absolutely fine.