Can I mix the use of fold-expr with fold-marker just as mixing fold-expr with fold-manual?

I read the below documentation:
>If you use the "expr" method to define folds, but they are not exactly how
>you want them, you could switch to the "manual" method. This will not remove
>the defined folds. Then you can delete or add folds manually.

It works very well.

However, if I want to switch to "marker" instead of "manual", I would lose all the foldings! Is there a way to mix up the expression fold-method with the marker fold-method? Thanks.

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