FAPAR, LAI and FCOVER creation

Dear all,

happy new year! I am developing an app that uses S1 and S2 products for creating several indices (NVDI, NDWI, VV, VH et cetera) via Python (gdal and Snappy libraries). Do you have any idea of how to create the fapar, lai and fcover indices? Can I use SNAP via Snappy to generate them?

Thanks in advance!