Chroma key

We need chroma key !!! Chroma key is free tool in every video editing app.. if that feature is not in premiere pro mobile that’s a big deal..!! Because premiere pro mobile is the one that I see as a most advanced,fast and also free the one and only editing app out there.. so chroma key should be this app.. and I also requested few days ago about masking feature .. if developers can make that happen ..premier pro mobile will be the best app as same as desktop version!!!