composer.jsonの書き方

前提・実現したいこと

下記サイトに従い、「git push heroku master」が実行したいです。
https://qiita.com/masaki-ogawa/items/2521d29c17eb8664cab8

しかし、エラーメッセージによると「composer.json」が検証できないみたいです。
「composer require linecorp/line-bot-sdk」を実行すると、lineBotのファイルの中身には「vendorファイル」「composer.json」「composer.lock」が落とせています。

composer.jsonの中身を書き換えようにも、何を書けばいいのか分からない状態です。
その他にも赤字のエラーメッセージがあり、改善箇所自体が違うのかもしれません。

発生している問題・エラーメッセージ

Enumerating objects: 828, done.
Counting objects: 100% (828/828), done.
Delta compression using up to 2 threads
Compressing objects: 100% (799/799), done.
Writing objects: 100% (828/828), 2.48 MiB | 800.00 KiB/s, done.
Total 828 (delta 551), reused 0 (delta 0), pack-reused 0
remote: Compressing source files... done.
remote: Building source:
remote:
remote: -----> Building on the Heroku-18 stack
remote: -----> Using buildpack: https://github.com/heroku/heroku-buildpack-php
remote: -----> PHP app detected
remote:
remote:  !     ERROR: Basic validation for 'composer.json' failed!
remote:  !
remote:  !     It must be a valid JSON document compatible with Composer.
remote:  !
remote:  !     You most likely created or edited the file by hand, and it now
remote:  !     contains a syntax error. Please refer to the documentation at
remote:  !     https://getcomposer.org/doc/ for information on the format.
remote:  !
remote:  !     You can run 'composer validate' locally on your computer for
remote:  !     further diagnosis. Remember to also always keep your lock file
remote:  !     up to date with any changes according to the instructions at
remote:  !     https://getcomposer.org/doc/01-basic-usage.md
remote:
remote:  !     Push rejected, failed to compile PHP app.
remote:
remote:  !     Push failed
remote:  !
remote:  ! ## Warning - The same version of this code has already been built: 英数字
remote:  !
remote:  ! We have detected that you have triggered a build from source code with version 英数字
remote:  ! at least twice. One common cause of this behavior is attempting to deploy code from a different branch.
remote:  !
remote:  ! If you are developing on a branch and deploying via git you must run:
remote:  !
remote:  !     git push heroku <branchname>:main
remote:  !
remote:  ! This article goes into details on the behavior:
remote:  !   https://devcenter.heroku.com/articles/duplicate-build-version
remote:
remote: Verifying deploy...
remote:
remote: !       Push rejected to アプリ名.
remote:
To https://git.heroku.com/アプリ名.git
 ! [remote rejected] master -> master (pre-receive hook declined)
error: failed to push some refs to 'https://git.heroku.com/アプリ名.git'

試したこと

エラーメッセージにあるように「composer validate」を入力すると下記が現れます。
https://getcomposer.org/doc/04-schema.mdにアクセスしてみたのですが、composer.jsonに入力すればいいのか分からずじまいです。

./composer.json is valid for simple usage with composer but has
strict errors that make it unable to be published as a package:
See https://getcomposer.org/doc/04-schema.md for details on the schema
name : The property name is required
description : The property description is required
No license specified, it is recommended to do so. For closed-source software you may use "proprietary" as license.