Conditional nested data in Strapi - jsonschema

Question

I'm trying to set up a strapi CMS which will allow a user to create an entry with a set of conditional tags.
The requirement is that they can create a product which has tags. Those tags are to be selected from a pre-defined nested list that looks something like this:
- Category 1
- Item 1
- Item 2
- Item 3
- Category 2
- Item 4
- Item 5
- Item 6
- Category 3
- Item 7
- Item 8
- Item 9
Each product can have multiple categories and each category can have multiple items. They need to select at least one category and for every category they select, they need to select at least one item.
So, for example, they could create a product which had a selection that looked like this:
- Category 2
- Item 4
- Category 3
- Item 8
- Item 9
I attempted to create a component which did sort of work but the user was able to select any item they wanted from any category instead of that item being limited to the parent category.
Is this something Strapi is capable of? If so, how do I go about it?
For reference, here are the schemas I set up for the category and items collections:
{
"kind": "collectionType",
"collectionName": "category",
"info": {
"singularName": "categories",
"pluralName": "category",
"displayName": "categories",
"description": ""
},
"options": {
"draftAndPublish": true
},
"pluginOptions": {},
"attributes": {
"Name": {
"type": "string",
"required": true
},
"categories": {
"type": "relation",
"relation": "oneToMany",
"target": "api::category.category",
"mappedBy": "category"
}
}
}
{
"kind": "collectionType",
"collectionName": "items",
"info": {
"singularName": "item",
"pluralName": "items",
"displayName": "items",
"description": ""
},
"options": {
"draftAndPublish": true
},
"pluginOptions": {},
"attributes": {
"Name": {
"type": "string",
"required": true
},
"domain": {
"type": "relation",
"relation": "manyToOne",
"target": "api::categories.categories",
"inversedBy": "items"
}
}
}
and here is the component I made:
{
"collectionName": "components_tags_tag_selectors",
"info": {
"displayName": "Tag Selector",
"icon": "tags",
"description": ""
},
"options": {},
"attributes": {
"domain": {
"type": "relation",
"relation": "oneToOne",
"target": "api::categories.categories"
},
"categories": {
"type": "relation",
"relation": "oneToMany",
"target": "api::item.item"
}
}
}