To pass value to the interpolation variable of the view from the Power BI, I would use the Power Query advanced editor option in the Power BI and provide the required value for the interpolation fields by doing the following steps:
* Open the Power BI tool, load the corresponding view and click on the **"Transform Data"** button.
* The view should open in a power query editor window. If not, then navigate to the Power Query Editor window.
* In the Queries tab, click on the name of the corresponding view and then click on **'Advanced Editor'**.
* In the Advanced Editor window, provide a value for the interpolation fields by using Power BI code. You can do this by using the table function [Table.SelectRows](https://docs.microsoft.com/en-us/powerquery-m/table-selectrows) in Power Query. Click **“Done”**. The data should load in the table.
Please refer to the linked [Microsoft documentation](https://docs.microsoft.com/en-us/powerquery-m/table-selectrows) for more information.
Hope this helps!!