managing e-magazines

i have a nice emag PDF collection and browsing the filesystem via a simple nginx file-browser is ok so far, but i miss the cover view, bookmarking of pages and a PDF search.

i sort the mags in this kind of folder-structure via flexget (but sort them manually into a year folder if a mag has many releases per year).

├── National Geographic
│   ├── 2024
│   ├── 2025
│   ├── National.Geographic.No.03.2026....
│   ├── National.Geographic.No.04.2026....
│   ├── National.Geographic.Plus.No.03.2024....
│   └── National.Geographic.Plus.No.04.2025....
│   ├── 2025
│   └── 2026
├── National Geographic Special
│   ├── National.Geographic.Special.No.22.2025.....
│   ├── National.Geographic.Special.No.23.2025.....
│   └── National.Geographic.Special.No.24.2026.....
├── National Geographic Traveler
│   ├── 2024
│   ├── 2025
│   └── 2026

i tried Kavita today which provide a nice cover view, but there is no grouping of magazines and i can not set a bookmark on a PDF page. I think it’s desinged for book/comics/mangas.

Does anyone has another nice suggestion for a emag collection?

Or an idea how i can get grouping for my first-level folders in Kavita?