Custom DropDown<SomeType> using UI Toolkit

Unity Engine
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1

Hello. Very straight forward question no gotchas. this is for a custom inspector in the editor.
I Have 1 File, Class A,

Class A Contains 3 Properties.
A user provided List of AnimClips
A user provided List of AudioClips
A List of Struct B

Struct B Contains
An AudioClip Field
An AnimClip Field
An int Field

For O(n) of Struct B List.
I would like to have the editor User select
1 Audio Clip and 1 Anim Clip from a popup or dropdown using data they provided to Class A Anim Clips and Class A Audio Clips variables.

All list are dynamic and can be 0(n) items.

How can i best use UI Toolkit to achieve this? As i have been struggling for the past few days.

2

The source data for the DropDown may be the names taken from the asset list.

dropDown.choices = AssetList.Select(i => i.name).ToList();

When the user performs a selection from the dropdown, refer to the selected index to retrieve the chosen asset.

var selectedAsset = AssetList[dropDown.index];

3

ah so this is something I understand as I have done something similar with the popup for UIToolkit.
Is it possible to assign this DropDown or PopUp to Class/StructB?

Most of my trouble comes from the fact that i want to have a list of Class/Struct B. which means I would need dropdowns/popups inside Class B. but the data to fill those dropdowns come from Class A Which Has Class B as a variable.