Optional
Where the engine should fetch grants from the supplied client, e.g. a Canvas resource at /canvases/<resourceId>/acl or a dataset at /projects/<id>/datasets/<ds>/acl. Omit to skip the grants fetch (the rendered $can stays undefined).
/canvases/<resourceId>/acl
/projects/<id>/datasets/<ds>/acl
$can
Where the engine should fetch grants from the supplied client, e.g. a Canvas resource at
/canvases/<resourceId>/aclor a dataset at/projects/<id>/datasets/<ds>/acl. Omit to skip the grants fetch (the rendered$canstays undefined).