dynamic slicer title based on user input value

I don’t think that is currently possible without additional tools, as it would require writeback to the model and real-time access to the entered value. You would likely need either Translytical Task Flows or PowerApps writing back to a database, with the entered value then accessed through DirectQuery. While the input slicer allows arbitrary values to be entered, those values are only used to filter the visuals. I don’t think there is currently a way to directly access the entered value itself.

powerbiexpert22 

Currently Power BI does not support where user can type in and that text becomes the slicer value.
The data must come from

1-Data Source.
2- Selection
3-Or parameters.

Workaround:

Create Disconnect Table approach
1-a disconnect table with "Title Selector" Table

2-Dynamic DAX measure.
3-Conditional formatting. 

This is fully support in Power BI Service as well.

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