Insert > Reference using a Variable

Hi!

I would like to ask if it is possible or if there is any workaround to passing a file path to a variable then using this variable for the Insert > Reference feature?

For example, my file is located at "C:\sample.xmcd".

I would like to assign it to a variable that:

FilePath:="C:\sample.xmcd"

Then use this file path for Insert > Reference > Insert Reference to File in another worksheet.

This is because I have some user-defined functions defined in sample.xmcd that I would like to call in another worksheet.

If this is not possible, is there any other way to reference user-defined functions?

Please note that hiding the functions in the worksheet is not an option. So is defining those user-defined functions in the same worksheet.

Thanks and best regards!