Custom Type part

{
  "Main": {
    "uid": {
      "type": "UID",
      "config": {
        "label": "Page Name",
        "placeholder": "Page name to fetch document"
      }
    },
    "document_title": {
      "type": "Text",
      "config": {
        "label": "document_title",
        "placeholder": "Redesign :: Index page",
        "useAsTitle": true
      }
    },
    "domain": {
      "type": "Select",
      "config": {
        "options": [
          "solutions",
          "perspectives",
          "campaigns",
          "press"
        ],
        "default_value": "solutions",
        "label": "domain"
      }
    },
    "subRouteLevel1": {
      "type": "Text",
      "config": {
        "label": "sub route level 1",
        "placeholder": "sub route level 1"
      }
    },
    "subRouteLevel2": {
      "type": "Text",
      "config": {
        "label": "sub route level 2",
        "placeholder": "sub route level 2"
      }
    },
    "background": {
      "type": "Image",
      "config": {
        "constraint": {
          "width": 1920
        },
        "thumbnails": [],
        "label": "background"
      }
    },
    "marquee": {
      "type": "Text",
      "config": {
        "label": "marquee",
        "placeholder": "marquee text"
      }
    }
  }
}

TypeScript

export const getDynamicDocument = async <T>(
  root: string,
  pid?: string,
  target?: string
): Promise<SearchResponseType<T>> => {
  const API = await Prismic.getApi(BASE_URL)
  const predicates = []
  predicates.push(Prismic.Predicates.any('my.primarytest.domain', [root]))
  if (pid) {
    predicates.push(Prismic.Predicates.at('my.primarytest.subRouteLevel1', pid))
  }
  if (target) {
    predicates.push(Prismic.Predicates.at('my.primarytest.subRouteLevel2', target))
  } else {
    predicates.push(Prismic.Predicates.missing('my.primarytest.subRouteLevel2'))
  }
  return await API.query(predicates, { pageSize: 100 })
}