Template Override for "fieldgroup.php" System Plugin?

Is it possible to create a template override for fieldgroup.php? It's located at:
\plugins\flexicontent_fields\fieldgroup\fieldgroup.php

I'm nearly certain it's this file I need to create an override for. The lines of code I'm looking to change are: I need to change the HTML a bit to enable some extra styling.

If not I could always clone the plugin, but then there will be some tedious upkeep on potential code changes.

Hello

it exists already but as parameter

there is a parameter inside the viewing TAB of the fieldgroup, to enable custom HTML
- thus you can create the exact HTML that you need

Very cool! I couldn't find one in a search; is there a reference sheet of commands that can be used, or is the tooltip with examples comprehensive?

Hm. Of the examples provided, only one seems to work: {{value##count}}

Hello

did you use exactly this text

{{fieldname}} ?

or did you use the real field name of field ?
e.g.
{{somefieldname}}

The former: {{fieldname}} 

The assumption being that this is a position being used in a for-loop.

Hello

you need to use the real field name
e.g. 'mygal' thus {{mygal}}
e.g. 'age'  thus {{age}}

e.g for and image gallery field with name 'mygal' you can use
{{mygal}}
or
{{mygal##single_total}}   (show a single thumbnail that will open up the gallery that show all other images, and will also show a total)
or
etc

Hm. I may have to persist with a core edit. I'd have to create the markup necessary for every new field I make. And if I need to change it, I'll have to do it with however many fields I end up at the time. Currently 21 and rapidly growing!

Hello

sure regardless of custom display being possible already

we do need a good enough "default" display layout

so what about adding the a CSS class with fieldname
changing to thus you will have a unique class

plus i will move the PHP / HTML code of the loop to a layout file ... 
(same layout structure like other fields)
code will be move to
tmpl/value_default.php

Hello

ok moving value loop code to template file is as easy as any other field

done, this should benefit other users using the fieldgroup field

Please try v3.2.1.15-rc
github.com/FLEXIcontent/flexicontent-cck/releases

you can now duplicate layout file tmpl/value_default.php
customize new file
and then select the new layout file in field configuration