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As far as I know, there is not a tool to export GPO backup to SCCM configuration item.
And I'm not very familiar with the tool SCT, I checked the following in documentations:
The SCT enables administrators to effectively manage their enterprise’s Group Policy Objects (GPOs). Using the toolkit, administrators can compare their current GPOs with Microsoft-recommended GPO baselines or other baselines, edit them, store them in GPO backup file format, and apply them broadly through Active Directory or individually through local policy.
Maybe SCT can't be combined with SCCM.
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