Clear parent from your bone on metarig (alt+P). Then in bone properties of your bone choose either basic.raw_copy or basic.super_copy rig type, then enable Relink constraint, after it in "Parent:" field you can enter name of the bone you want your bone to be child. If you want basic.pivot you can create new bone and parent it to your bone and then choose rig type basic.pivot as usual.
Dmitry
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