The Canadian Emergency Response Benefit is taxable income. Here is a link for reference. Since it is Canadian taxable income, under the treaty you would report it as taxable income on your US return if filing as resident here.
You can use the "Other Reportable Income" topic to include that payment.
Click the "Wages & Income" tab
Scroll down to "Less Common Income"
"Show More"
"Start/Revisit" the "Miscellaneous Income" topic
"Start/Revisit" the "Other reportable Income" topic
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