Convert [group: xxx] to a text value with togroup

I need help. I have a dropdownField where I select three options
but they come to me like
[group: 67] [group: 68] [group: 69]
but these values ​​(office 2300, office 2450, office 2800)
I have them in a constant.
I'm trying the example below but I can not get it in the dropdown
I get the values ​​I want (office 2300, office 2450, office 2800) and
not the ones that come out ([group: 67] [group: 68] [group: 69])

a!dropdownField(
label: "OFFICE",
placeholderLabel: "Selection",
choicelabels: {
cons!CP_typeOffice
},
choicevalues: {
cons!CP_typeOffice
},
value: local!filter.type,
/*value: togroup(local!filter.type),"description",*/
saveInto: local!filter.type
),

thanks

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