Collection feature improvement

I would like a separate feature for hashtag (#)-based collections to be added.
Currently, all items are stored only within the 'Collections' function, making management feel somewhat complex. For example, 'Life Drama' and '#Romance' are treated as the same collection despite being different categories, making them difficult to distinguish. Example:
[Collection]
-Life Movie
- A book I want to read again
- Recommended Drama
[Hashtag]
-#Romance
-#Action
-#Hero
-#Reasoning
It would also be great if a 'sub-collection (folder)' feature were added, allowing you to put other collections inside a collection. Example:
Good books to read this season
Spring
├─ Summer
├─ Autumn
└─ Winter
Author
├─ JK Rowling
├─ Kim Cho-yeop
├─ Bernard Werber
William Shakespeare
👍
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