You posted this same question earlier in the "general" section of this forum and were asked for clarification. Posting it again, in the same form, in the "tips and tricks" section doesn't exactly clarify anything.
I can`t believe you`ve never heard of phrase markers. They`re used for guitar, also piano or bass, when using chord symbols, to indicate any particular phrasing that needs to be followed. Appearing as a note, tail down, crotchet, quaver or minim, with a line angled to the right instead of a note head.
There is no native support for these. Try the scripto - there might be a user font that contains them (check under "helpful files"). If so, you can insert them as text objects. They won't play,
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