Add arrowheads at end-beginning of diagonal lines

Hello,
I am a Finale orphan here experimenting with Musescore. I write a lot of exercises sets for very young violin students and their parents who generally don't read music very well.
So I need to write many text frames with explanations and like to have lines with arrows pointing towards the notes in the music to which these explanations refer. Often times these have to be diagonal.
I did experiment with Dorico, but the fact text frames in Dorico can't be assigned to specific bars is a deal breaker for me at the moment.
I have found several threads on this forum dating from many years back about this lines and arrows issue, but not many recent ones.
None of the hooks proposed in the Lines Properties are arrows. I tried inserting a "<" as beginning text, but it doesn't show.
I know I could print the part as pdf and add arrowed lines from a pdf editor at the end of the project, but it would be nice to be able to do it in Musescore. Especially for later editing.
I joined the Musescore file I am working on. The lines are between a text frame above the first staff and notes in the 1st staff. I also joined a pdf of a Finale produced exercises set with examples of the kind of arrowed lines I need.
Thank you for any help,
Jean