Shadow and outline in paragraph styles.

Hello, Community Experts.

Please guide me with the following:

I want to configure a paragraph style that has the appearance of the attached image, which is composed by a text frame and a geometric figure, both independent of each other, with the disadvantage that when modifying the text, the geometric figure must be manually modified to maintain the proportions, with the implications in various resources such as time.

Using the Paragraph Shadow tool, I have tried to generate a style that automatically adapts as the text is modified, but I have not found it possible, because when configuring the measures of the paragraph shadow, its dimensions remain the same when the text is modified, which generates, 1.- much white space, or that the text enters the gray area, and 2.- in Corner Size and Shape, within its options, I do not see one that allows me to only modify the upper left corner in order to generate the geometric figure that I need.

In Shear X Angle: it affects the whole paragraph, deforming the text and the other 3 corners of the rectangle.

Is there any way to do this?

Attached is the file.

Thank you.