Installs fine inside a C10S container (also installing manually dependencies not already in stable):

[root@1087a3e03110 /]# dnf install -y https://kojipkgs.fedoraproject.org//packages/python-flask/3.1.0/2.el10_0/noarch/python3-flask-3.1.0-2.el10_0.noarch.rpm https://kojipkgs.fedoraproject.org//pack
ages/python-flask/3.1.0/2.el10_0/noarch/python3-flask+async-3.1.0-2.el10_0.noarch.rpm https://kojipkgs.fedoraproject.org//packages/python-blinker/1.9.0/1.el10_0/noarch/python3-blinker-1.9.0-1.el10_0
.noarch.rpm https://kojipkgs.fedoraproject.org//packages/python-dotenv/1.0.1/3.el10_0/noarch/python3-dotenv-1.0.1-3.el10_0.noarch.rpm                                 
python3-flask-3.1.0-2.el10_0.noarch.rpm                                                                                                                               287 kB/s | 197 kB     00:00
python3-flask+async-3.1.0-2.el10_0.noarch.rpm                                                                                                                          25 kB/s | 9.5 kB     00:00
python3-blinker-1.9.0-1.el10_0.noarch.rpm                                                                                                                              71 kB/s |  27 kB     00:00
python3-dotenv-1.0.1-3.el10_0.noarch.rpm                                                                                                                               99 kB/s |  46 kB     00:00
Dependencies resolved.

And import is ok too:

[root@1087a3e03110 /]# python3
Python 3.12.5 (main, Aug 23 2024, 00:00:00) [GCC 14.2.1 20240801 (Red Hat 14.2.1-1)] on linux                                                                         
Type "help", "copyright", "credits" or "license" for more information.                                                                                                
>>> import flask
>>>