Any chance that GrapheneOS is going to add a toggle to enable support for 32-bit apps?

Many old abandoned apps aren't working anymore on the pixel 7a.
I heard 32-bit is still supported by the hardware but disabled by the firmware.

32-bit support will not be enabled. Apps on the Play Store have needed to provide 64-bit versions for a very long time. Any app not providing an 64-bit version is abandoned and likely insecure at this point.

Also, apps not being 64-bit weakens security as significant features like hardened_malloc won't work with them.

In short, it's counter to the project's goals.