Right way to claim WFH tax relief through the self-assesment

As WFH tax relief needs to be claimed through the self assesment when one is both employed and self-employed, is this section of the self-assesment the right one for claiming WFH tax relief? - “Do you wish to claim any employment expenses or capital allowances while working for …” and then add the amount in this field - “Other expenses and capital allowances”?

Hi,
That's correct.
Enter the amount in box 20, under 'Other Expenses and Capital Allowances'.
Thank you.