Blueprint list item as nested field

Hi guys. This is my first post here so please don't judge me.
The problem which I'm struggling to resolve is that I need to have a list of fields to be as subitem of current set of fields. The textarea does not fit, because I need these items to be as li's on a view. So it should be like this:
Blocks
You see a set of blocks and the list should be in every of them. The one on a screenshot was achieved in this way:

fields:
  *here's other text fields*
  .columns-details:
    type: list
    label: Columns details

But when I press 'Add item' it shows me two fields and they are inactive:
Nested list
I know that I did not configure any of fields inside. But if I do:

fields:
  *here's other text fields*
  .columns-details:
    type: list
    label: Columns details
      fields:
        .text:
          type: text
          label: text  

the page in admin panel just disappear, which I consider as wrong yaml syntax.

Can you please point me in right direction, how to make nested subitem in list as another list with text fields?
Much thanks in advance!

Should work fine. Example:

          fields:
            header.features:
              name: features
              type: list
              label: Features

              fields:
                .icon:
                  type: text
                  label: Icon
                .header:
                  type: text
                  label: Header
                .text:
                  type: text
                  label: Text

Also, support for lists was improved in Grav 1.1. Check the 1.1 beta too, to see if your issue is solved in it.

Hey, thanks for the reply. Unfortunately you have pasted exactly the same code which I did, and this will not solve an issue. On your example: every feature should have additional nested list of text fields, besides of icon, header and text. I'll show the code for better understanding:

features:
  type: tab
  title: Features

  fields:
    header.features:
      name: features
      type: list
      label: Features

      # set of fields for every feature
      fields:
        .icon:
          type: text
          label: Icon
        .header:
          type: text
          label: Header
        .text:  
          type: text
          label: Text
        # nested list of details for every feature
        # does not work
        .list:
          type: list
          label: feature details
            fields:
              type: text
              label: detail

Hope this will make things more clear. I presume this is pretty easy, but I'm missing something...

Are you running Grav 1.1 beta? There was some extensive improvements made in 1.1. We are currently in beta with a new beta to be released today. If all goes well we plan on making it 'final' next week.

I was on stable but upgraded after your message. It worked like a charm then, thanks a lot for your help guys.