If you are producing text, to be displayed in Pencil2D on a bitmapped layer, then my advice is to produce it at least 120% the largest size that you conceive that you require.
It is possible to write software to be able to make enlargement of bitmapped images, but the task is very complex amd as a result most software producers, including Pencil2D, don’t implement this function.
This is because bitmapped graphics can be reduced in size, without distortion, particularly if the edge is feathered.
Feathering us a technique to make the outer edge of the shape appear to be smooth. When using bitmapped tools the Feathering is applied at the drawing stage.
In contrast when using vector tools, the feathering is applied at the conversion to a bitmapped format. This allows it to be adjusted to make the edge look smooth. When the camera zooms in, when using vectors, the Feathering is adjusted.