Dashboard API - special character in body request

Hi all,

I am trying to create a dashboard with a graph panel by calling POST /api/dashboards/db, and putting inside dashboard parameter all necessary data as they are returned by the GET /api/dashboards/uid/:uid (when graph has being created manually).

The y-axis should have μm/m3 as unit. When I use con?gm as a value for the axis’ format though, the created panel shows an error message that “conμgm unit is not supported”. It seems that this special character cannot be processed.
Do you know whether there is another way to provide that character through the API?