Actually, both stars are already in SpaceEngine. Gliese 877, however, only under the name "HIP 113229". But because the data has been updated a bit, I have both made it new. (Gaia)Bobiverse
Epsilon Eridani has the planets procedurally generated by SE.
But I gave Gliese 877 a planet and a dyson sphere.
(Put this in the 'addons' folder.)
(For the Dyson Sphere you need a strong computer!