Hi Agnish Kumar Das , I'm not aware of a GEM equivalent (noting their site says they hope to expand to sites in India soon...) but I wonder if you can make a start using the Global Biodiversity Information Facility (https://www.gbif.org/ ). GBIF entries do have some trait info. Although a perfect, pre-defined functional trait search does not yet seem to be available, you can make do: for example, searching 'shade toleran*' in occurrences and then selecting a geographic area (available by latitude or by drawing a shape on the map under the 'location' menu dropdown) will return a list of species for you.
Here's a 2018 paper that might be of interest: Towards an Ecological Trait-data Standard, https://www.biorxiv.org/content/10.1101/328302v1.full.pdf