You may have to add them manually.
Determine where in the bars you want to add slashes.
You will need to use text notation for the slashes. It is common to use the "/" symbol to denote a slash. For example, if you want to add a slash to the second beat, you could write something like:
mathematica
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| G / D / | C / G / |
Where the "/" stands for a slash.
Incorporate these symbols into your bass guitar notation in the appropriate places. If you are using a music notation editor, make sure you enter the text in the correct cells of the notebook.
Once you have entered the symbols, make sure they are displayed correctly and as you expect them to appear. Sometimes music editors may not display text notation, so make sure it is visible when you print the sheet music.
Play the part to make sure the slashes match your expectations and add the right rhythm to your playing.
