Changing unit settings of already placed labels?

Hi,

I’m using the Environmental Analysis tab and commands to understand a site - sun path, radiation benefits, wind roses, etc.

Here is a small issue I’ve encountered:
I haven’t checked all the units before going through everything I’ve needed and I realised, that the wind speed is was set to miles per hour: but I work in SI, so I’ve changed the unit of speed to m/s via the PO_UnitSettings command - hoping that it would change all my legends.

However, this setting has no effect on already placed legends:

Furthermore, if I edit a legend, I see no way to change the unit:

Am I missing something?
If not, I would find the option of changing legend units later useful, this would decouple them from a global setting and make reporting far easier.

Versions
Rhino SR37 (7.37.24107.15001)**
Pollination PO.V1.54.3.0

** I’m having issues with loading the Environmental Analysis tab in Rhino 8, that’s why I use Rhino 7 for this, but I’m pretty sure it was working before updating to this release.