How to use JSII_RUNTIME override with projen compile?

[attilah]

I'm trying to add .NET binding to Projen, which works, but as I do JSII changes as well, I'd like to use my local JSII for it. When executing JSII_RUNTIME=<jsii dir>/packages/jsii-runtime/bin/jsii-runtime yarn compile in projen dir, it is using the version from node_modules.

I did not find pointers to it either here or in projen or I'm doing something wrong.

What is the expected workflow when one debugs JSII bugs comping up with other packages development cycle?

UPDATE:

I think that the problem is that the JS runtime does not support the JSII_RUNTIME variable and will always use the bundled version. Am I right?