Losses in investments in funds

I am an employee, and have some savings in investment funds (non-ISA). If I have made losses in the tax year (i.e. the value in April 2023 is lower than the value of those investments in April 2022), do I need to include this somewhere in the self-assessment? Or is it only when there is a profit in the investments that one has to declare as a capital gain? Thank you

Hi Carol Brown,
You would need to clarify what type of investment funds.
Thank you.