Hello Koala Huynh,
Thank you for reaching out to Microsoft Support!!
While working on meeting attendance report and also for fetching the online meeting ID, since it is mentioned in the documentation to configure Application access policy while using the application permissions, unfortunately there isn't any programmatic way of configuring the policies other than the PowerShell commands.
If this is blocking your requirement in developing solutions going further, you can submit this feature request using this support link, which will be monitored by Microsoft team and make the enhancements to Graph API.
Also as a workaround at this moment, I would recommend you raising a support case with Microsoft Azure, a Support Engineer will be able to look into this issue and assist you better. You can raise support ticket from New support request - Microsoft Entra admin center or https://admin.microsoft.com/#/support/requests.
Hope this helps.
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