Some time ago I wrote a Telegram bot that copies messages to a Google Sheet (can be personal & private). The rationale is to quickly capture data in a semi-structured format and tidy it up at a later point. Expense tracking in conjunction with this spreadsheet would be a great use-case; it can also upload pictures (for receipts) and other file attachments.
I was thinking of doing a really simple app to just capture your txs after you have paid at e.g. the grocery store. Maybe I will build it some time in the future.
https://t.me/gsheet_notes_bot