Need Assistance with Specifying Runtime for Website Deployment via API

I’m creating a website through an API and need to specify the runtime for the site to function correctly. I’m using a payload like this:

Here’s a snippet of the payload I’m using:

    "name": "test",
    "repo": {
        "id": "123",
        "provider": "github",
        "deploy_key_id": "345",
        "repo_path": "username/reponame",
        "repo_branch": "main",
        "dir": ".next",
        "cmd": "npm run build",
        "public_repo": false,
        "repo_url": "",
        "installation_id": "567",
        "base": "/"

However, I couldn’t find a specific parameter to set the runtime. Without specifying the runtime, the website won’t work properly. I attempted to include runtime: "nextjs" in the repo section, but it didn’t work.

Is there a particular parameter or configuration I should use to specify the runtime for the website? If so, could you guide me on where and how to include it in the API payload?

The setting is available here: /sites/<site-id>/ with the data:

  "plugins": [{
    "package": "@netlify/plugin-gatsby" // or `@netlify/plugin-nextjs`
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