Coordinate Geometry: JEE Main 2026 Mathematics question

Let the centre of the circle $x^2+y^2+2gx+2fy+25=0$ be in the first quadrant and lie on the line $2x-y=4$. Let the area of an equilateral triangle inscribed in the circle be $27\sqrt3$. Then the square of the length of the chord of the circle on the line $x=1$ is ________.