I am new to Fritzing and have been using the STM32F103 Blue Pill module for several applications. I would think that others may be using the same.
I am looking for the part object to use in Fritzing.
A google search for “fritzing part STM32F103 Blue Pill” turns up
which contains BluePill.fzpz (a Fritzing part available for download). If that doesn’t do exactly what you need it can be fairly easily modified to match you board as most of the work is already done.