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not much of an expert on audio signals. I believe LINE is typically 1V peak to peak. So +/- 0.2 equal 0.4Vpp. ruffly half. And then noting that the output of the VS1053 is not LINE, but a driver for low impedance speakers. either 8 or 16 Ohm. And think is some kind of D type amplifier.

If you need more power I recall documenting somewhere in the github doc an API to change to mono and add the currents of both the outputs into one channel. Someone did this for a stuffed toy. So it would appear to be more current based then voltage.