how should i properly add public channels from prefix-dev?

[black-ether]

maybe a newbie question but i can't figure out how to display a name of the channel's url in the toml file, i've check the offcial doc and it only shows you how it works with one channel or multiple channels with the same data type ("conda-forge", "robostack", "bioconda"...) how do i do one "conda-forge" and one custom channel like ["meta-forge", "https://repo.prefix.dev/meta-forge"]

and why is channels like meta-forge not woking? the conda's -c with url approch works but "pixi add" is not working(
)