How do I declare foreign income from foreign employment (company with no UK presence)?

Since August 2023, I have started employment with a foreign company in my home country (Vietnam). The contract allows me to work entirely remotely in the UK, which I have done so till now. I understand that I need to declare this income to HMRC which I'm trying to do through the Online Self Assessment in my Tax Account. But I'm not sure at all how to fill the information from the Online Self Assessment. The online form in the employment section, for example, asked for the income as written on the P45 or P60. But my income doesn't involve any of these forms. And how would I declare the income I fill in the Employment section as foreign income? How exactly should I fill out the Online Self Assessment to accurately reflect my foreign employment and income? Additionally, would this foreign employment show up in my HMRC Employment History letter?

Hi,
Please refer to guidance at:- Tax on foreign income and associated links.
Thank you.

Hello, I've gone through the information provided on the website. But I'm still unsure If it's accurate to report my foreign income in the box that asked for income as written on the P45 or P60 form. Additionally, would this foreign employment show up in my HMRC Employment History letter? Kind regards, Tuan 

[Personal information deleted - Admin]

Hi amgamo1

You would report the income either on the SA102 or SA103 on the tax return and as no p45/p60 you should use payslip information.
This employment will not show up on your HMRC employment history as this is for PAYE sources only.

Thank you