A single-file Cloudflare Worker that bridges Telegram MarkdownV2 and plain text:
/to_markdown— reply to a formatted Telegram message (or a caption) and the bot reconstructs the equivalent MarkdownV2 source from the message's text + entities, sent back as plain text (so you can copy-paste it)./to_telegram <MarkdownV2>— send MarkdownV2 source and the bot renders it as a formatted Telegram message.
Your just create a Cloudflare Worker, copy script.js contents, set a secret for your bot token, register the webhook once, and you're done. No database or other storage is needed.