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Here we present a hole-compensation study by introducing extra itinerant electrons via a Ni substitution in the ferromagnetic superconductor RbEuFe$_4$As$_4$ with $T_{\\mathrm{sc}}>T_{\\mathrm{m}}$. With the Ni doping, $T_{\\mathrm{sc}}$ decreases rapidly, and the Eu-spin ferromagnetism and its $T_{\\mathrm{m}}$ remain unchanged. 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