Mirror attribute in Custom shape for Texts

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Is your feature request related to a problem? Please describe.

Hello,
i am describing custom shapes. In the shape i use placeholder texts for Data. When i mirror my shape the text is also mirrored and not readable anymore. Sadly i couldn't find a way to mirror the text inside the shape or give a parameter so that the text "orientation" remains the same.

Thanks for your help!

Describe the solution you'd like
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I would like to have a parameter which is called "flip" or "mirrored" which i can set in the Data to flip the Text.

Describe alternatives you've considered
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As alternative i had created Text objects. But they are "in the way" when i connect my Objects. Therefor the textfield in my custom shapes are nice.

Additional context
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No source file, test, or entry point is named in the issue. Start by locating the JavaScript code responsible for custom-shape text and mirroring, then determine how the requested parameter fits the existing shape data; done means mirrored shapes keep their placeholder text readable.