How to migrate Gitlab pages from file storage to s3 storage?

I am trying to migrate Gitlab omnibus (v13.8.2) to Gitlab kubernetes (Migrating from Omnibus-GitLab package based installation | GitLab), all worked good so far but the problem is: there is no commands to migrate pages from file storage to s3 storage (as in the case of artifacts or uploads for example).

is there a way to migrate pages (even manually) from local filesystem to s3 storage ?