How do I use a filter to add a background to a source with color key filter already applied?

[Spinball]

Hello,
first of all there doesn't seem to be an intuitive forum to post requests for help. So this thread will inevitably be in the wrong forum. Sorry about that. Perhaps a moderator can move it with my apologies?

Anyway, we have used Zoom + OBS to broadcast live streams on a weekly basis since lockdown.

As you can see, the Zoom name tags are tiny and there is no way to enlarge or style them in Zoom.
I'm exploring switching to speaker view on Zoom and I want to display the speaker's name tag much larger.
So I'm doing a second window capture just of the name tag, placing it bottom left over the first Zoom window capture.
I'm then applying a color key filter to remove the dark grey background to show only the white of the text.

I now want to add a colour (#9d2362) background under the white text. Is there a way to do this using a filter which stacks with the color key?
Or is there a different filter I can use to achieve the display of the white text name tag on a specific color background?
My alternative is to add a color source or image underneath, but I want to achieve this using a filter if possible to keep it simple. Is it possible?

Many thanks in advance for any help you can give.

 

[AaronD]

The key simply makes things transparent. So put the background *under* the keyed source. Not as a filter, but as a separate source in the scene.

 

[Spinball]

The key simply makes things transparent. So put the background *under* the keyed source. Not as a filter, but as a separate source in the scene.

Thanks, yes, I wanted to try and do without another source and was wondering whether there is a clever way to do it with the filters.