I found a nice workaround for preserving arbitrary context settings on AWS #CDK
using local files:
https://github.com/bifravst/aws/commit/a2ca511355d5e1025ab098058e50b5a8ebdebd59

An RFC exists already ( https://github.com/aws/aws-cdk-rfcs/issues/18) but it
can be solved today, albeit not CDK native.