Q.Mimosa
Are mimosa shrubs/trees acid loving? Would Westland grosure, all purpose compost be suitable for mimosa?

Mimosa do prefer a acid soil in the 4.4 to 5 ph range.
A soil test will help you determine if you need soil amendments.
Your County Extension service can help you with a soil test for a few dollars.
Here are some links to help you.
https://www.gardeningknowhow.com/extension-search/
https://www.gardeningknowhow.com/ornamental/trees/mimosa/mimosa-tree-weeds.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/special/organic/the-importance-of-soil-for-an-organic-garden.htm