Share folders but maintain files hierarchy structure

Hi, I’m not using either Group Folders or Access Control apps (just checked on apps), only the apps already installed in vanilla Nextcloud. When enabling certain user groups to edit or view a folder, I’m using the default web menu:

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The approach of using a flat structure of folders doesn’t fit too well our organization. Typically we have cases like these (asuming hierarchical permissions/overrides):

Projects (r/w for Admin)
    Customers (r for Sales)
        Customer 1
            Documents (r/w for Sales, r for Finance and Legal)
                Brief (r for Tech)
                Contract
                Statement of Interest (r/w for Legal)
                NDA (r/w Legal)
            Memos (r for Everyone)
            Design (r for Tech, r/w for the project manager)
            Source (r/w for Tech)
            Releases (r/w for Tech)