Output Feature for Custom Blocks

[rouzbehali]

I'm building a custom block in Fxdreema and want to replicate the variable selection feature of the native "Modify Variable" block. Specifically, I want a field in my block where users can right-click to choose a target variable from a list, and my block will then store its output (e.g., an extracted string) into that variable.

How can I implement this right-click variable picker in a custom block? I've attached images for reference.
Currently The right-click menu on any custom block's input currently works in "read" mode (blockinput = v::output_save). I need to change this to "write" mode (v::output_save= blockinput).

[l'andorrà]

Unless jstap can provide some help here (sadly, I cannot) I would recommend contacting the admin directly.