contenttype choice label

Hello,

I use contentype choice:

Other parameters are optional.

contenttype_choice:
type: choice
options:
required: false
label: ContentType selection
choices: content
params:
contenttype: pages
label: title
value: slug
limit: 4
sort: title
order: DESC # "ASC" or "DESC"
where:
and: { 'koala': 'bear' }
or: { 'koala': 'dangerous' }

But how can I in the label choose 2 columns?

for example: title and slug

contenttype_choice:
type: choice
options:
required: false
label: ContentType selection
choices: content
params:
contenttype: pages
label: title, slug