def METHOD_NAME(self, metric_name: str, statistic_name: str) -> dict:
    """Return the baseline value corresponding to the key."""
    key = self._tag.format(metric_name, statistic_name)
    baseline = self._baselines.METHOD_NAME(key)
    if baseline:
        target = baseline.METHOD_NAME("target")
        delta_percentage = baseline.METHOD_NAME("delta_percentage")
        return {
            "target": target,
            "delta": delta_percentage * target / 100,
        }
    return None