Hello Zindians,
Here are external datasets I used in my workflow,
1. Sentinel-2,Level-2A MultiSpectral Imagery https://developers.google.com/earth-engine/datasets/catalog/COPERNICUS_S2_SR#description
2. FAO/UNESCO Digital Soil Map of the world https://data.apps.fao.org/map/catalog/static/api/records/446ed430-8383-11db-b9b2-000d939bc5d8
3. Lithological Classification A new Geo-Lithological Map (Geo-LiM) for Central Europe (Germany, France, Switzerland, Austria, Slovenia, and Northern Italy) https://zenodo.org/record/2432045