How to do GraphQL query in NestJs like in WikiJs?

Question

I found this query in Graphql wikijs.

UserQuery: {
    async list(obj, args, context, info) {
      return WIKI.models.users.query()
        .select('id', 'email', 'name', 'providerKey', 'isSystem', 'isActive', 'createdAt', 'lastLoginAt')
    },
    async search(obj, args, context, info) {
      return WIKI.models.users.query()
        .where('email', 'like', `%${args.query}%`)
        .orWhere('name', 'like', `%${args.query}%`)
        .limit(10)
        .select('id', 'email', 'name', 'providerKey', 'createdAt')
    },
    async single(obj, args, context, info) {
      let usr = await WIKI.models.users.query().findById(args.id)
      usr.password = ''
      usr.tfaSecret = ''

      const str = _.get(WIKI.auth.strategies, usr.providerKey)
      str.strategy = _.find(WIKI.data.authentication, ['key', str.strategyKey])
      usr.providerName = str.displayName
      usr.providerIs2FACapable = _.get(str, 'strategy.useForm', false)

      return usr
    }... 

You can execute several functions at once in one query.

Here is the question, how to replicate this in NestJs?