How to use the google-ads-node.GenerateForecastMetricsRequest function in google-ads-node

public async generateForecastMetrics(id: number | string): Promise {
        const request = new GenerateForecastMetricsRequest()
        request.setKeywordPlan(`customers/${this.cid}/${RESOURCE_URL_NAME}/${id}`)
        const response = await this.service.generateForecastMetrics(request)
        const [parsed] = this.parseServiceResults([response]) as GenerateForecastMetricsResponse[]
        return parsed
    }