Just like you would record any loan or any capital contribution.
It does not matter if loans come from banks, owners, friends, etc. Investments are recorded under equity, but loans are liabilities and you just record them as such. Just search the forum on loans and forget about that this is from owner and you will find numerous posts that will help.
If capital under equity search the forum for similar.
This is a loan you should recognize as a liability.
In many jurisdictions including your own (I’m sure), you have to file a return for any change in the equity contribution structure or amounts. If you are certain there isn’t going to be anything like that now or in the future, just keep it under loans.