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It depends on the internal circuit. Reading the datasheet should help.
--> Do a datasheet search for "gain".
This is not a typical class D circuit. I wonder how they describe the circuit. (It more looks like a linear circuit).
I doubt the the paths influence gain.
TDA2822 is a linear rather than class D amplifier.
The amplifier has an internal resistor network determining the gain. The gain can be reduced but not raised by external component connection.
The output connected RC circuit are "Boucherot Cells" (see https://en.wikipedia.org/wiki/Boucherot_cell). Their purpose is suppression of possible parasitic oscillations not gin setting. They need a good ground connection, together with power supply bypassing.
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