How to use the vscode-azureextensionui.LocationListStep.addStep function in vscode-azureextensionui

public async createChildImpl(context: ICreateChildImplContext): Promise {
        const client: CosmosDBManagementClient = createAzureClient(this.root, CosmosDBManagementClient);
        const wizardContext: ICosmosDBWizardContext = Object.assign(context, this.root);

        const promptSteps: AzureWizardPromptStep[] = [
            new CosmosDBAccountNameStep(),
            new CosmosDBAccountApiStep(),
            new ResourceGroupListStep()
        ];
        LocationListStep.addStep(wizardContext, promptSteps);

        const wizard = new AzureWizard(wizardContext, {
            promptSteps,
            executeSteps: [
                new CosmosDBAccountCreateStep()
            ],
            title: 'Create new Cosmos DB account'
        });

        await wizard.prompt();

        wizardContext.telemetry.properties.defaultExperience = wizardContext.defaultExperience.api;

        context.showCreatingTreeItem(wizardContext.accountName);
        await wizard.execute();
        // don't wait

public async getSubWizard(wizardContext: IAppServiceWizardContext): Promise | undefined> {
        if (!wizardContext.plan) {
            const promptSteps: AzureWizardPromptStep[] = [new AppServicePlanNameStep(), new AppServicePlanSkuStep(), new ResourceGroupListStep()];
            LocationListStep.addStep(wizardContext, promptSteps);
            return {
                promptSteps: promptSteps,
                executeSteps: [new AppServicePlanCreateStep()]
            };
        } else {
            return undefined;
        }
    }

public async getSubWizard(wizardContext: IAppServiceWizardContext): Promise | undefined> {
        if (!wizardContext.appInsightsComponent && !wizardContext.appInsightsSkip) {
            const promptSteps: AzureWizardPromptStep[] = [new AppInsightsNameStep()];
            LocationListStep.addStep(wizardContext, promptSteps);
            return {
                promptSteps: promptSteps,
                executeSteps: [new AppInsightsCreateStep()]
            };
        } else {
            return undefined;
        }
    }