Is it possible to transpose only the chord?

OK... so here's more info. explaining the steps in the pictures posted earlier:

You add a duplicate staff using menu item: Edit -> Instruments, then copy/paste everything from the first staff into it.
So, to create the new staff (add an instrument), see:
https://musescore.org/en/handbook/3/create-new-score#change-Instrument-…
and:
https://musescore.org/en/handbook/3/create-new-score#add-instruments
For copy/paste, see:
https://musescore.org/en/handbook/3/copy-and-paste

Once you have the staff duplicated, select the entire duplicate staff and transpose it into the key of C. The chord symbols (what you need for the capo change) will be transposed along with the melody.
For selecting a range of measures (i.e. the duplicate staff):
https://musescore.org/en/handbook/3/selection-modes#select-measure-range
For transposition, see:
https://musescore.org/en/handbook/3/transposition#transpose-chromatical…

To delete the original chord symbols, right click on one -> 'Select' -> 'All Similar Elements in Same Staff' -> press delete.

Copy/paste the transposed chord symbols into the original staff by right clicking on one -> 'Select' -> 'All Similar Elements in Same Staff' then Ctrl +C to copy them. Then paste the copied chords by selecting the first measure of the original staff and pressing Ctrl + V.

To remove the duplicate (transposed) staff go back to Edit -> Instruments, then select the duplicate instrument and click the 'Remove' button. This will leave only one staff with the transposed chord symbols.

Finally, add some staff text instruction for the capo position:
https://musescore.org/en/handbook/3/text-basics#add-text