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For Custom Label you don’t need to add a slot for that you can directly change the label.
<q-file
outlined
class="registration-field"
label-color="red"
v-model="registrationNumber"
:label="labelText"
>
<template v-slot:label>
<div><q-icon name="photo"></q-icon> Custom Label</div>
</template>
</q-file>
Source:stackexchange.com