Just use a HTML table in the markdown card.
type: markdown
content: >-
<table width=100%>
<tr><td align=left>termostat 1</td><td align=right width=10%>26.8</td><td align=right width=30>52.2</tr>
<tr><td align=left>termostat 2</td><td align=right>19.8</td><td align=right>42.2</tr>
</table>
The width should only be necessary to set in the first row and the rest will adhere to that.