Efcore: Replacement for RelationalMetadataExtensions?

[OpenSpacesAndPlaces]

I used to be able to-do like:

IEntityType entityType = ...;
foreach (IProperty propertyType in entityType.GetProperties())
{
     var relational = propertyType.Relational()
}

To get "IRelationalPropertyAnnotations".

This seems to have come from "RelationalMetadataExtensions" - those no longer seem to be present.

What's the replacement?

Specifically I was using it to get:

relational.ColumnName
relational.ColumnType

Further technical details

EF Core version: 3.1
Database provider: Microsoft.EntityFrameworkCore.SqlServer
Target framework: .NET Framework 4.8

[AndriySvyryd]

C# foreach (var propertyType in entityType.GetProperties()) { propertyType.SetColumnName(""); propertyType.SetColumnType(""); }