How to set custom gasPrice for upgrades.deployProxy()

I have a deploy script for Hardhat where I am using the upgrades package. I would like to set a custom gasPrice so I end up paying the known ETH amount as txn fees, but I couldn't find this argument in the function parameters.

The hardhat-deploy package allows to pass such arguments, but it didn't work for upgrades.deployProxy()

Currently the only way to configure this is through Hardhat's config file.

Nice, that'll work for now.
A suggestion would be to make it available as function parameters.