Hi, yes it is possible. Some resources:
Concept doc and snippets: https://github.com/esri/arcgis-pro-sdk/wiki/ProConcepts-Geoprocessing#executing-model-and-script-too...
More getting started resources found here: https://github.com/esri/arcgis-pro-sdk/wiki/ProConcepts-Migrating-to-ArcGIS-Pro
I've a last question.
I found that the method i was looking for is "OpenToolDialog", but i've noticed that the tool script doesn't load the first time if the geoprocessing pane isn't opened (ONLY THE FIRST TIME THERE'S THIS BUG). Do you have some suggestion?