Hi Maria,
it depends on what you will do with that field.
1) if this field is used only for information purpose, you can create a custom field on the form and capture the data there. This is not synced to CDS and therefore you cannot use it in integrations or in PowerBI
2) if you want this field to be used in integration scenarios, you can do an embedded PowerApp (Canvas) and these data can be later used.
regards,
nicu
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