You can try it:

config interface 'wan'
        option ifname 'wan'
        option proto 'dhcp'

config interface 'wan_pppoe'
        option hostname 'GL-MV1000-d03'
        option metric '10'
        option username '**********@vodafone'
        option password '*************'
        option disabled '0'
        option proto 'pppoe'
        option ipv6 'auto'
        option ifname 'wan.100' <---- I needed this to obtain pppoe connection

config interface 'wan_tv'
        option ifname 'wan.105'
        option proto 'dhcp'
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