Using chart to track changes over time

Hi, I'm monitoring the progress of recovery from injury and need to analyse changes in grip strength over time. I would like to use a chart with grip strength on the Y axis and time along the X axis.
Unfortunately, the records were not taken at regular intervals, so the chart resulting from my data gives a misleading visual of progress. For example, my dates are sometimes one week apart, sometimes two, sometimes four.
Is there a way to get the time intervals to scale properly? That is, at the moment each date is at an equal point along the X axis, regardless of how long between the two dates (3 April, 14 April, 28 May and so on). What I want is for those dates to be separated along the X axis in equivalent proportions to their relationship in time (thus 3 April would be much closer to 14 April, than 14 April is to 28 May).
My only thought is to manually extrapolate the "missing" dates and guess the grip strength on those dates. Unfortunately this will defeat the purpose of the exercise. Any help most gratefully accepted, thank you!

An XY scatter plot (third from the bottom) will preserve proportions on both axes. Connect the points with (straight) lines for a broken line graph.
Regards,
Barry

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