So I've tried to do this via various methods. It appears that the way the item comes from Forms is not synonymous with how SharePoint wants it and I can't find any documentation as to what that is.
What kind of input is the SharePoint connector looking for?
Do you want to save the contents of the Multiple Choice submitted by the user on the Form to the Multiple Choice type Column in the SharePoint list?
With the SharePoint-Create item, there is really no good way to use the submitted content to fill the of the Multiple Choice type.
I am afraid that Flow does not support such a feature at present.
If you want to feature that you mentioned to be supported in Microsoft Flow, please consider submit this as an idea in the Microsoft Flow idea forum:
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