Lightweight/zeroweight links

[reregaga]

Is your feature request related to a problem? Please describe.
Lightweight/zeroweight links that do not affect the position of the nodes. The nodes in the mermaid line up according to some kind of gravity, and I would like to have zeroweight links that simply show the connection of two nodes without changing position of nodes.

Example:

flowchart LR
A --> B --> C
C --- A

What I get:

What I want:

Here I would like to see the link C --- A as zeroweight link.

Describe the solution you'd like
I'm assuming this will require extension of syntax for marking link as lightweight, for example:

flowchart LR
A --> B --> C
C +++ A

Describe alternatives you've considered
I don't know about alternatives.
I think this request relates to requests about explicit set ranking/hierarchy for nodes: #418, #1312, #2098.

Additional context
Inspiration: green and orange lines in this org-chart https://gojs.net/latest/samples/orgChartExtras.html

P.S. Would like to see this feature also for mindmap mode #3410
Possible syntax:

mindmap
  A <1>
    B
      C <2>

<1> +++ <2>