EF Core and SQL Functions

Hello,

I'm trying to update a SQL FUNCTION in my database via EF Core migration. 

IF NOT EXISTS(SELECT * FROM [dbo].[_EFMigrationsHistory] WHERE [MigrationId] = N'20201108022316_UpdateCombineEventrFunction11072020')
BEGIN

                                            /* Drop function if it already exists so we can recreate it */
                                            DROP FUNCTION if exists [dbo].[GetCombinedResources]                                
                                     
END;

GO

IF NOT EXISTS(SELECT * FROM [dbo].[_EFMigrationsHistory] WHERE [MigrationId] = N'20201108022316_UpdateCombineEventrFunction11072020')
BEGIN

                                            /* This will take the name of the Resource Type and use the Event id and Event event id to obtain a list of resources of the resource type and combine them together separated by a comma */
                                            CREATE FUNCTION [dbo].[GetCombinedResources]
                                            (@resourceTypeName VARCHAR(max),
                                            @EventId INT,
                                            @EventEventId INT)
                                            RETURNS VARCHAR(max)
                                            AS
                                            BEGIN													  

                                            Return (Select distinct dbo.EventResources.EventResourceId
                                                                             FROM            dbo.Events INNER JOIN
                                                                                                       dbo.Events ON dbo.Events.EventId = dbo.Events.EventId INNER JOIN
                                                                                                       dbo.EventResourceTypes INNER JOIN
                                                                                                       dbo.EventResources INNER JOIN
                                                                                                       dbo.EventResourceEvents ON dbo.EventResources.EventResourceId = dbo.EventResourceEvents.EventResourceId ON 
                                                                                                       dbo.EventResourceTypes.EventResourceTypeId = dbo.EventResources.EventResourceTypeId ON 
                                                                                                       dbo.Events.EventId = dbo.EventResourceEvents.EventId
    														                                           where dbo.Events.EventId = @EventEventId and dbo.EventResourceTypes.Name = @resourceTypeName and dbo.Events.EventId = @EventId
                                            FOR JSON AUTO)
                                     
END;

GO

IF NOT EXISTS(SELECT * FROM [dbo].[_EFMigrationsHistory] WHERE [MigrationId] = N'20201108022316_UpdateCombineEventrFunction11072020')
BEGIN
    INSERT INTO [dbo].[_EFMigrationsHistory] ([MigrationId], [ProductVersion])
    VALUES (N'20201108022316_UpdateCombineEventrFunction11072020', N'2.2.1-servicing-10028');
END;

GO

When I run `script-migration -i` to test it on my database, I see this error:

Msg 156, Level 15, State 1, Line 1295
Incorrect syntax near the keyword 'FUNCTION'.
Msg 137, Level 15, State 2, Line 1311
Must declare the scalar variable "@scheduleId".

Incorrect syntax: 'CREATE FUNCTION' must be the only statement in the batch.

Are FUNCTIONs not allow to be added within EF Core Migration?