If you are resident in the UK, but not domiciled, and you do not bring this income into the UK, then it is not taxable in the UK, and you do not include it on the Self Assessment return.
If at some point in time, you bring it in to the UK you will declare it on your Self Assessment return in the year you bring it to the UK. You can claim for tax relief on foreign tax paid on this income. You can see the guidance on residence, domicile and remittance to see how this affects you here:
Residence, domicile and the remittance basis: RDR1