HoMM VII Haven Units – Haven faction units from the seventh installment of Heroes of Might and Magic.

it turned out that there are no animations in the seventh game that correspond to the "Power Leap" ability. I wanted to give them a jump like the elder demons, but unfortunately, it wasn't possible.

You can always create it from pieces of existing animations.
The demon-jumper's jump animation consists of three parts: start, flight, and landing. The flight is a 1-frame animation where the demon has its legs bent. Both the flight, start, and landing can easily be made from ordinary movement animations of the footman, since it already jumps when moving.

Footman, am I right in understanding that you deliberately don't make all these models from the sixth game available for public use, but instead post screenshots and videos here just to, let's say, show off your "skills"? Or am I mistaken?