templates and the log --debug output the extra fields

[Uwe Brauer]

Hi 

Hg log -G --debug

Shows me 

 changeset:   432:cb80c31c1d905f4f5e94957b7c9b1f9f17e8b566
│  branch:      year-20-21
│  tag:         tip
│  topic:       fechas-controles
│  phase:       draft
│  parent:      431:ceb486e510e0a490b8d3e20260c21683c5b1e726
│  parent:      -1:0000000000000000000000000000000000000000
│  manifest:    417:cc0fb0f5e65d48e54b640dc9fcd046a171889358
│  user:        Uwe Brauer <oub at mat.ucm.es>
│  date:        Fri Dec 25 09:12:30 2020 +0100
│  files:       aulas-controles.org
│  extra:       branch=year-20-21
│  extra:       topic=fechas-controles
│  description:

I would like to create a template (with colors) to include the topic
extra field


  extra:       topic=fechas-controles

Can anybody please point out to me the required syntax for this field?

Thanks

Uwe Brauer