Migration from local(hosted) yum repo to nexus3 hosted yum repo

We have local hosted yum repo for internal use. We generate bunch of RPMs as part of build process and put it in local yum repo (and run create repo to update).

Now, I have installed nexus3 OSS and created hosted yum repo in nexus. Is there a easier way to migrate existing local repo into nexus ?
OR move all the artifacts directly to nexus storage (on file system) and update nexus metadata to reflect it ?