@Rizwan, Thanks for posting in Q&A.
From your description, I know you want to give local user with administrator rights via Intune.
Based on my research, there are three methods to add users to administrator group via Intune.
1.Using a PowerShell Script
2.Using an Autopilot Deployment Profile
3.Using Local User Group Membership policy
Here is a link with detailed information you can refer.
https://techpress.net/add-a-user-group-to-local-admin-using-intune-3-ways/
Non-official, just for reference.
Please note that only Microsoft Entra users are available for method 2 and method 3.
Hope above information can be helpful.
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