How to move dependencies out of effects when creating a layer

import { Context, Effect } from "effect"

import { Item } from "../schema"
import { AiError } from "./error"

export interface AiService {
  readonly analyzeImageForLineItems: (
    imageData: Uint8Array,
  ) => Effect.Effect<readonly Item[], AiError> // custom E, no R 
}

export const AiService = Context.GenericTag<AiService>("AiService")

const response = yield* AiLanguageModel.generateObject({
  prompt: userMessage,
  schema: Schema.Struct({
    items: Schema.Array(Item),
  }),
})