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Are you using analytics.js V2 or the old analytics.js from segment?

We'll be implementing V2 in the next week or so

In that case, you can use the new middlewares feature. Something like this:

analytics.addSourceMiddleware(
  function({ payload, next, integrations }) {
    const experiments = [];
    growthbook.getAllResults().forEach(function({experiment, result}) {
      experiments.push(experiment.key + "::" + result.variationId)
    });
    payload.obj.experiments = experiments;
    next(payload);
  }
)