Custom icons in case of multiple similar services

[InitPatch]

Hey there,

I'm just starting with Station, and coming from Ferdium, they have the possibility to customize the icon on the services bar, so I can differentiate between different accounts from the same platform.
Like on Slack for instance, I have 3 different spaces, and I'd like to see the icon for each of them, instead of the default Slack icon, like so:

Thank you!

[jcolinger3]

Same request here. Custom icons.