Allow nested form controls

[astorije]

Following up a conversation on Slack, I would like to request the ability to design nested controls as such:

At CloudHealth, we have a lot of form controls following this format, often having to select an option and provide 1 or 2 settings for that option. We are currently converting our platform to Clarity and encountering a lot of those patterns. Some definitely need rethinking the page/form, but in many cases it makes sense UX wise.

I was hoping that the current components would let us do something like this, but each attempt had one small thing preventing it. I’ve been trying all sorts of combinations using helper components such as CdsInputGroup and CdsControl but so far haven’t been able to make the input even just show up at all.
In a nutshell, to produce the mock above, that third row cannot be a CdsControl because that will only let me use 1 control (vs. 2: checkbox + input), and it cannot be a CdsInputGroup (which lets me have more than 1 control) because the CdsCheckboxGroup only fills slots with cds-control elements while the CdsInputGroup is a cds-control-group).
Would you be open to consider this in Clarity Core?