Failed to execute PosixPath('dot'), make sure the Graphviz executables are on your systems' PATH

I installed graphviz, add the environment path, then installed python-graphviz on anaconda prompt, and the code run sccessfully on JupyterNotebook.

On Datalore, I installed graphviz, but when I tried to install python-graphviz on Datalore, it reported the error “ERROR: Could not find a version that satisfies the requirement python-graphviz (from versions: none)
ERROR: No matching distribution found for python-graphviz”
So, I continually got the error as my headline showed, is this Dataloler’s bug?