Use [sharedmedia=core:attachments:5259] for now.
Right click the effects pane or the mixer and click Track plugin paramerters.
For effects, use ‘show in mixer’ then left click that in the mixer (this can be scripted now though, so if anyone feels like it…)
For plugins, have an Instrument automation device in a track and select it, pick a slot which to bind to the parameter in that slot, then click the square near the number.
Here’s the official thread. https://forum.renoise.com/t/tool-idea-param-predictor-working-prototypes-attached/38136