At present. the official document do not provide the direct ways to complete this requirements. But it seems you could use some third-party application to move it to another tenant. For more details about its discussion, you could check this thread:
Can we migrate guest users along with their chat from one tenant to another tenant as it is tenant to tenant migration? if yes then what are requirements and how we can do it?
Vinod Survase
4,726
Reputation points
Can we migrate guest users along with their chat from one tenant to another tenant as it is tenant to tenant migration? if yes then what are requirements and how we can do it?
Accepted answer
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JimmyYang-MSFT 50,446 Reputation points Microsoft Vendor
2021-08-13T10:58:13.543+00:00