Automatic image inclusion mechanism (dirpath, filename, compatible with !include)

Question

Hello, i am trying to create a pattern of code able to automatically include an image into a diagram only based on the image name and compatible with the include mechanism.
For information, i use a local installation of plantuml (.jar file on windows).

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To introduce my questions (below), i propose the following situation:

• 2 files are in the same folder :
  •  parent.plantuml
  •  child.plantuml
• Facts
  • parent.plantuml includes child.plantuml
  • child.plantuml contains an image named "foo.png"
  • "foo.png" is located in a subfolder called "inc_child.plantuml" (normative name for automation)
  • Compilation command should stay independant of the content of the files (no use of -Dfoo="<PATH>" for flexibility reasons.

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# Code of "child.plantuml":

@startuml

' image file are inside a sub folder called "inc_<filename>" (normative name for automation)
!$dPath     = "inc_"+%filename()
:<img:$dPath/foo.png{scale=0.2}>;

:"DEBUG child" {
    "version"     : %version()
    "dirpath"     : %dirpath()
    "filename"   : %filename()
    "dPath"      : $dPath
};

@enduml

Result when compiled:

[Image is present]

"DEBUG child" {
    "version": 1.2023.5
    "dirpath":
    "filename": child.plantuml
    "dPath": inc_child.plantuml
}

---

# Code of "parent.plantuml"

@startuml

!include child.plantuml

:"DEBUG parent" {
    "version"     : %version()
    "dirpath"     : %dirpath()
    "filename"   : %filename()
    "dPath"      : $dPath
}

@enduml

Resul when compiled:

(Cannot decode) [Image is NOT present]

DEBUG child" {
    "version": 1.2023.5
    "dirpath":
    "filename": parent.plantuml
    "dPath": inc_parent.plantuml}
    
"DEBUG parent" {
    "version": 1.2023.5
    "dirpath":
    "filename": parent.plantuml
    "dPath": inc_parent.plantuml
}

---

# My questions:

1. how to get the current filename and not the one of the parent file ?
   The result of  "parent.plantuml" shows that "DEBUG child" is equal to "DEBUG parent". It means that %filename() is only setted by the first compiled file.
2. how to get the absolute path of the current file (for image hyperlink automation) ?
   Then the code could be (image inclusion + hyperlink):
   !$dPathFull = %dirpath()+"/inc_"+%filename()
   :[[$dPathFull/foo.png <img:$dPath/foo.png{scale=0.2}>]];
3. how to get the current file title (means filename without the extension) ?
   f(parent.plantuml) -> parent

For flexibility reasons, i cannot customize -Dfoo="<hard coded absolute path>" args in the compilation command line.

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I hope to be clear and understandable.

Thank you

Regards.