Sudesh, presently there is no plugin to connect NEST with MT4, a bunch of companies are working on it, there is an option for AMI to NEST.
If you are using data anywhere outside your trading platform, you have to ideally subscribe to data from an authorized data vendor, like Esignal, Global data feeds and others. Yes there are workarounds that certain people use to pull data directly from NEST to MT4 and others, but they are not really reliable and you won’t get backfills very easily.