Help needed with referencing subcategories in a blog schema in Sanity Studio

Hello Everyone, I have two schemas saved as documents one is blog and other one is category. category schema has subcategory as an array. I am getting an error on the highlighted code in bold part in blog schema. Could anyone help me out by telling what went wrong in the bold portion of blog schema(schema 1). Objective: I want to get subcategories in subcategory field of blog schema as drop down options from category schema in sanity studio. Schema -1

export default {

title: 'Blog',

name: 'blog',

type: 'document',

fields: [

{

title: 'Title',

name: 'title',

type: 'string',

},

{

title: 'Description',

name: 'description',

type: 'string',

},

{

title: 'Tags',

name: 'tags',

type: 'string',

},

{

name: 'category',

title: 'Category',

type: 'reference',

to: [{ type: 'category' }],

},

{

name: 'subcategory',

title: 'subcategory',

type: 'reference',

to: [{ type: 'category', of: [{type: 'array', to: [{ type: 'subcategory' }],}] }],

},

],

};

schema -2

export default {

title: 'Category',

name: 'category',

type: 'document',

fields: [

{

title: 'Name',

name: 'name',

type: 'string',

},

{

title: 'Subcategory',

name: 'subcategory',

type: 'array',

of: [{

type: 'object',

fields: [

{

title: 'Name',

name: 'name',

type: 'string',

to: [{ type: 'subcategory' }],

},

],

}],

},

],

};

the best would be if you have subcategories as separate document, and each subcategory should have parent category

Thanks . Thanks I will project subcategory as a separate document schema. I learned a new thing from you , Thank you so much.