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In the numeric scalebar in QGIS 3 is it possible to add a thousands seperator of ',' and also some text after the value?
This should be "1:500,000 at B0" for example.
I have tried Display and Font options but can't find anything to format the value as numerical with a thousands seperator or add a suffix text.
You may achieve what you want by using HTML-frame in the Layout.
In the Layout add a HTML-frame 
, choose 'Source' as HTML-source and add a similar code like this
[%'Scale 1:' || format_number(map_get(item_variables('atlas_map'), 'map_scale'),0) || ' at B0'%]
Change atlas_map to the name (id) of your map.
If you need the comma as separator, this may be the solution (works on my computer set up for Norway):
'Scale 1:' || regexp_replace(format_number(map_get(item_variables('atlas_map'), 'map_scale'),0),'\\D',',') || ' at B0'
Read more about regexp_replace: https://www.techonthenet.com/oracle/functions/regexp_replace.php
You may use additional HTML style- or CSS-code to change the appearance further.
