Is there any native Netsuite functionality to add Approval stop for Inventory Adjustments?

There is not. It's an instant GL Impacting Transaction. You could create a Suitelet to hold the data and require approval and upon approval creates an IA.

I was trying to prevent a custom work since I don't know scripting. Thank you

Some customers include a "Review" button which updates a checkbox indicated it has been reviewed. The finance team would then have a saved search of IAs which are due for "review".

For Netsite 2022.2 I saw something called SuiteApprovals Enhancements "Enable Draft Status – You can set a preference to enable certain record types to be saved as a draft before it goes through the approvals routing process. On the General subtab of the Approval Preferences page (Setup > Approval Process Manager > Preferences), you can select which record types can be saved as a draft in the Enable Draft Status field." Is inventory adjustments supported?

Thank you for the info. I will request our RP instance and take a look to it.