experiment_viewed

growthBook = new GrowthBook({
            enableDevMode,
            trackingCallback: (experiment, result) => {
              dispatch(`${GENERAL}/trackGoogleAction`, {
                payload: {
                  event: 'experiment_viewed',
                  event_category: 'experiment',
                  experiment_id: experiment.key,
                  variation_id: result.variationId,
                },
              });
            },

SELECT
  user_pseudo_id as anonymous_id,
  TIMESTAMP_MICROS(event_timestamp) as timestamp,
  experiment_id_param.value.string_value AS experiment_id,
  variation_id_param.value.int_value AS variation_id,
  geo.country as country,
  traffic_source.source as source,
  traffic_source.medium as medium,
  device.category as device,
  device.web_info.browser as browser,
  device.operating_system as os
FROM
  `growthbook-ga4-396012`.`analytics_308238632`.`events_*`,
  UNNEST(event_params) AS experiment_id_param,
  UNNEST(event_params) AS variation_id_param
WHERE
  _TABLE_SUFFIX BETWEEN '{{startYear}}{{startMonth}}{{startDay}}' AND '{{endYear}}{{endMonth}}{{endDay}}'
  AND event_name = 'experiment_viewed'  
  AND experiment_id_param.key = 'experiment_id'
  AND variation_id_param.key = 'variation_id'
  AND user_pseudo_id is not null