We uncover a mechanism for realizing three-component quantum droplets in ultracold Bose gases, where only one interspecies interaction is attractive. In this scheme, the interspecies attraction leads to a self-bound binary droplet, and the third component is incorporated through Rabi coupling with one component of the binary droplet. We find that a stronger Rabi coupling leads to a larger fraction of the third component, but also destabilizes the entire droplet due to the involvement of more repulsive forces. Such instability can be remedied by a finite detuning between the Rabi-coupled components. We demonstrate these results in realistic Na-Rb mixtures, using both thermodynamic analyses and numerical simulations based on extended Gross-Pitaevskii equations. Our work outlines a general route for stabilizing multicomponent droplets by bridging an existing binary droplet with additional components via suitable single-particle fields.

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• Bose-Einstein condensates