Yes and no, front brake axle to frame soft line should have a square block on each side, the axle side is bolted to axle breather bolt, the frame side is bolted to the frame and the hard line then goes into it. That looks like maybe a rear soft line. In your picture that bolt just forward of the hard line is where it looks like long ago it was bolted, you can see the shape of the block in the paint. I actually think it should be the spot where the cable clamp is though. Looks like someone before you used that cable clamp as the line clamp instead of the double sided block soft line.
It will work as you have it, using that cable clamp to keep it from moving around. Using the double sided block front soft line keep the parts to a minimum.