Create a line entity with a pre fixed length (dimension)

Bonjour,

Like it is possible creating a circle radius or diameter with a defined dimension using its properties panel, i would like to fix, in the same way, the length (dimension) of a line entity.

Now, the length of a line entity appears in its properties panel but it is not possible to modify it (because it is shadowed).

Is there a possibility to change this ??

 

Thanks for your support !