Share internet over external wlan

I have multiple devices (A, B, C). Device A is a sensor that captures data and shares it with device C (Android) over a local Wi-Fi network. The problem is that the application to receive data only works on Android, and Android does not support being connected to two networks simultaneously, so when C connects to the Wi-Fi that A emits, it can correctly receive the data captured by A, but loses internet connection. I would like to know if a third device B (Ubuntu 23.10) with internet thanks to a 4G modem, can connect to the Wi-Fi network that A broadcasts and share internet through that Wi-Fi network so that C has internet when it connects to A's Wi-Fi. A is not configurable, it is a purchased device and I cannot modify anything. A emits a Wi-Fi signal and to receive data it is necessary to connect an Android device (C) to A's Wi-Fi network in order to receive data from its application. If A could connect to a hotspot issued by C there would be no problem since A and C would be connected and C would maintain an internet connection. However, A's app does not support that functionality and the only way to receive the data captured by A is to connect C to the Wi-Fi created by A. I would like to know if I can add another device (B), with an OS that does support simultaneous connection of network interfaces (for example Ubuntu) and share the internet through the Wi-Fi created by A. I have searched many similar questions about it, but none that solve my problem. In most of the questions asked, the internet is shared through a network cable or by creating a hotspot, however, I need to share the internet through the Wi-Fi network that A creates and not create a new one. On the other hand, I have found a lot of information about bridges and bonding, but I have not achieved favorable results either.