How to send multiple data to Google Sheet?

I don’t have a sample project that would be very helpful.

You can see some examples of it here, though: Create and Save Data in Firebase

This community desperately needs better Firebase documentation and tutorials. I hope the staff will make that a priority.

The tricky thing about multiple editors in Google Sheets is that things like creating or deleting rows can affect other values such as the “number of rows” block. So it may work for you depending on what your needs are.