first_as_label not working

I have a contact form at the bottom of the page that has 2 select menus set up like so:

<label class=”large-6 medium-12 small-12 column”>[select lead_contact_channel first_as_label “Preferred Contact Channel” “Email” “Phone” “WhatsApp/WeChat/Line”]</label>

<label class=”large-6 medium-12 small-12 column”>[select lead_preferred_language first_as_label “Preferred Language” “English” “Deutsch” “Русский” “繁體中文” “简体中文”]</label>

I want to keep the first options of both menus as labels only, but when I send the form, it shows up in the CRM. Is there a way to leave it blank or change it to a “none” value?

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