Thanks very much for looking into this.
If you aren't familiar with the inner workings of Umbrel AND the bitcoin.conf file, it doesn't seem very easy/safe. Here are some people discussing making changes to bitcoin.conf on Umbrel:
https://community.umbrel.com/t/umbrel-5-0-update-where-is-bitcoin-conf/8060/2
I just run Arch Linux and run Bitcoin Core as a program on my system.
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