Hello group.
I'm making an inkscape extension that gives me a json file, but I can't get the font.size property of a text

-------------------------- Code ---------------------------------------------------

import inkex
import json
import os
from lastDirectoryAndFile import getRuta

class GetJson(inkex.EffectExtension):
    def add_arguments(self, pars):
        pass # We don't need arguments for this extension

    def effect(self):
        data = [] # Lista de diccionarios
        for elem in self.svg.selection:
            if elem.typename == "TextElement":
                json_data = {
                    "id": elem.get("id"),
                    "type": elem.typename,
                    "text": elem.get_text(),
                    "width": elem.get("width"),
                    "height": elem.get("height"),
                    "x": elem.get("x"),
                    "y": elem.get("y"),
                    "font-size":elem.get("style")
                } 
            else:
                href=getRuta(elem.get("xlink:href"))
                json_data = {
                    "id": elem.get("id"),
                    "type": elem.typename,
                    "width": elem.get("width"),
                    "height": elem.get("height"),
                    "x": elem.get("x"),
                    "y": elem.get("y"),
                    "href":href
                }

            data.append(json_data)

        json_string = json.dumps(data, indent=4)

        #file_path = os.path.join(os.getcwd(), "myJson.json")
        with open("miruta/myJson.json", "w") as file:
            file.write(json_string)

if __name__ == '__main__':
    GetJson().run()

------------------------------- End Code -------------------------------

"font-size":elem.get("style")["font-size"] it does not work

I want to show you the Json I am getting

------------------------------------ JSON---------------------------------------

[
    {
        "id": "tarjetas",
        "type": "Image",
        "width": "135.46666",
        "height": "135.46666",
        "x": "26.346313",
        "y": "-23.362434",
        "href": "Downloads/2118338.png"
    },
    {
        "id": "texto1",
        "type": "TextElement",
        "text": "Hola esta es una prueba para mirar \ncomo funciona este texto de \nverdad",
        "width": null,
        "height": null,
        "x": "22.099817",
        "y": "93.789467",
        "font-size": "font-weight:bold;font-size:6.35px;line-height:1.25;font-family:Goldman;-inkscape-font-specification:'Goldman Bold';letter-spacing:0px;word-spacing:0px;white-space:pre;inline-size:123.644;display:inline;stroke-width:0.264583"
    },
    {
        "id": "cerebro",
        "type": "Image",
        "width": "69.528175",
        "height": "59.186085",
        "x": "95.512871",
        "y": "62.81852",
        "href": "Downloads/1787077.png"
    }
]

------------------------------------ End JSON -----------------------------------

True font size is a combination of the svg font-size, the element transform and all of the composed transforms going back to the svg root.

It can also be set via class or attribute.

However if you want to get a font-size just in the inline style ( which should override class/attribute )

if selected_item.TAG == 'text':

font_size = selected_item.style.get('font-size')

'get' will return None if there is no inline style entry.

If you want to detected font-size from class or attribute ( where there is no inline style ) you can use:

specified_font_size = selected_item.specified_style().get('font-size')

Perfect, thank you very much