How to add/update timephased remaining work using a flow in Power Automate?

I'm trying to work out how to add or update timephased remaining work to an existing assignment using a flow in Power Automate, for example between Jan 1st and Jan 10th..

As far as I can see I need to do something like either of the following:

https://URL.sharepoint.com/sites/URL/_api/projectserver/EnterpriseResources('<Id>')/Assignments/GetTimePhaseByUrl(start='2022-01-04',end='2022-01-10')  

https://URL.sharepoint.com/sites/URL/_api/projectserver/EnterpriseResources('<Id>')/Assignments/GetTimePhaseByUrl(start='2022-01-04',end='2022-01-10')/Assignments('<Id>')

But from there I can't work out how to actually make a timephased remaining work update?

Many thanks