Prioritize Cellular over Wifi? - Android Q&A, Help & Troubleshooting

Hello everyone,
I have searched but have been unable to find an answer so I will ask the question
Is it possible to Prioritize a Cellular connection over a Wifi connection?
The main reason for this question is that we are running many Rugged android devices with a PTT application on them and when they connect to a buildings Wi-Fi network it can be congested and cause poor results. So we are looking to have the Android PTT devices connect primarily to Cellular and then when they drop Cellular signal as they head into a basement or a blackspot etc, it will search for a pre-configured Wi-Fi network and then connect it to until the Cellular network is available again.
Pretty much, we would like to know if its possible to get them to work in reverse. Prioritize Cellular over Wi-Fi rather than the default prioritize Wi-FI over Cellular.
Any assistance would be greatly appreciated
Cheers.

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Hello,
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